| Nominal | 20640 |
| Cardinal | twenty thousand six hundred forty |
Cardinal twenty thousand six hundred forty | |
| Ordinal | 20,640th |
| Number of digits | 5 |
| Sum of digits | 12 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 2 x 2 x 2 x 3 x 5 x 43 |
| Prime factorization in exponent form | 25 x 3 x 5 x 43 |
| Prime factors | 2, 3, 5, 43 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 8 |
| Sum of prime factors | 53 |
| Product of prime factors | 1290 |
| Is 20640 a prime number? | No |
| Is 20640 a semiprime number? | No |
| Is 20640 a Chen prime number? | No |
| Is 20640 a Mersenne prime number? | No |
| Is 20640 a Catalan number? | No |
| Is 20640 a Fibonacci number? | No |
| Is 20640 a Idoneal number? | No |
| Square of 20640 (n2) | 426009600 |
| Cube of 20640 (n3) | 8792838144000 |
| Square root of 20640 | 143.66627996854 |
| Natural Logarithm (ln) of 20640 | 9.9349862195955 |
| Decimal Logarithm (log) of 20640 | 4.3147096929552 |
| Sine of 20640 | -0.26068733348606 |
| Cosecant of 20640 | -3.8360129992793 |
| Cosine of 20640 | 0.96542328237925 |
| Secant of 20640 | 1.0358150857265 |
| Tangent of 20640 | -0.27002387268267 |
| Cotangent of 20640 | -3.7033762610137 |
| The spelling of 20640 in words is "twenty thousand six hundred forty", meaning that: |
| 20640 is not an aban number (as it contains the letter a) |
| 20640 is not an eban number (as it contains the letter e) |
| 20640 is not an iban number (as it contains the letter i) |
| 20640 is not an oban number (as it contains the letter o) |
| 20640 is not a tban number (as it contains the letter t) |
| 20640 is not an uban number (as it contains the letter u) |
| Bengali numerals | ২০৬৪০ |
| Eastern Arabic numerals | ٢٠٬٦٤٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓍧𓎉 |
| Khmer numerals | ២០៦៤០ |
| Japanese numerals | 二万六百四十 |
| Roman numerals | n/a |
| Thai numerals | ๒๐๖๔๐ |
| Arabic | عشرون ألف و ستة مائة و أربعون |
| Croatian | dvadeset tisuća šeststo četrdeset |
| Czech | dvacet tisíc šest set čtyřicet |
| Danish | tyve tusinde seks hundrede fyrre |
| Dutch | twintigduizend zeshonderdveertig |
| Estonian | akpe blaeve alafa ade kple blaene |
| Faroese | tjúgo tusin og sekshundraðogfýrati |
| Filipino | dalawáng pû libó’t anim na daán at ápat na pû |
| Finnish | kaksikymmentätuhattakuusisataaneljäkymmentä |
| French | vingt mille six cent quarante |
| Greek | είκοσι χίλιάδες εξακόσια σαράντα |
| German | zwanzigtausendsechshundertvierzig |
| Hebrew | עשרים אלף שש מאות ארבעים |
| Hindi | बीस हज़ार छह सौ चालीस |
| Hungarian | húszezerhatszáznegyven |
| Icelandic | tuttugu þúsund og sexhundrað og fjörutíu |
| Indonesian | dua puluh ribu enam ratus empat puluh |
| Italian | ventimilaseicentoquaranta |
| Japanese | 二万六百四十 |
| Korean | 이만 육백사십 |
| Latvian | divdesmit tūkstoši sešsimt četrdesmit |
| Lithuanian | dvidešimt tūkstančių šeši šimtai keturiasdešimt |
| Norwegian | tjue tusen seks hundre og førti |
| Persian | بیست هزار و ششصد و چهل |
| Polish | dwadzieścia tysięcy sześćset czterdzieści |
| Portuguese | vinte mil seiscentos e quarenta |
| Romanian | douăzeci mii şase sute patruzeci |
| Russian | двадцать тысяч шестьсот сорок |
| Serbian | двадесет хиљада шестсто четрдесет |
| Slovak | dvadsať tisíc šesťsto štyridsať |
| Slovene | dvaset tisuću šesto štirideset |
| Spanish | veinte mil seiscientos cuarenta |
| Swahili | elfu ishirini, mia sita na arobaini |
| Swedish | tjugotusensexhundrafyrtio |
| Thai | สองหมื่นหกร้อยสี่สิบ |
| Turkish | yirmi bin altı yüz kırk |
| Ukrainian | двадцять тисяч шістсот сорок |
| Vietnamese | hai mươi nghìn sáu trăm bốn mươi |
| Number 20640 reversed | 04602 | |
| Unicode Character | U+50A0 | 傠 |
| Unix Timestamp | Thu, 01 Jan 1970 05:44:00 +0000 | |