Names of 81920
| Nominal | 81920 |
| Cardinal | eighty-one thousand nine hundred twenty |
| Ordinal | 81,920th |
| This number as US currency | eighty-one thousand nine hundred twenty dollars |
| Is 81920 an odd number? | 81920 is NOT an odd number |
| Is 81920 an even number? | 81920 is an even number |
| Is 81920 a palindrome? | 81920 is NOT a palindrome number |
| Is 81920 a triangle number? | 81920 is NOT a triangle number |
81920 in other Bases
| Base 2 (Binary) | 101000000000000002 |
| Base 3 (Ternary) | 110111010023 |
| Base 4 (Quaternary) | 1100000004 |
| Base 5 (Quinary) | 101101405 |
| Base 6 (Senary) | 14311326 |
| Base 8 (Octal) | 2400008 |
| Base 12 (Duodecimal) | 3B4A812 |
| Base 16 (Hexadecimal) | 1400016 |
| Base 20 (Vigesimal) | A4G020 |
Primes and Factors tests for 81920
| Is 81920 a Prime Number? | 81920 is NOT a prime |
| Is 81920 a perfect number? | 81920 is NOT a perfect number |
| Is 81920 a Mersenne Prime? | 81920 is NOT a Mersenne prime |
| Is 81920 a Fermat Prime? | 81920 is NOT a Fermat prime |
| Is 81920 a Fibonacci Prime? | 81920 is NOT a Fibonacci prime |
| Is 81920 a Partition Prime? | 81920 is NOT a Partition prime |
| Is 81920 a Pell Prime? | 81920 is NOT a Pell prime |
| Prime Factors | Prime factors of 81920 |
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81920 in other Numerals
| 81920 in Roman Numeral | LXXXMCMXX |
| 81920 in Chinese Numeral | 捌萬壹仟玖佰貳拾 |
| 81920 in Egyptian Numeral | 𓂴𓆼𓍪𓎇 |
| 81920 in Babylonian Numeral |    |
Roots and stuff for 81920
| Is 81920 a square number? | 81920 is NOT a square number |
| Is 81920 a cube number? | 81920 is NOT a cube number |
| Square root of the number 81920 | 286.21670111997 |
| Cube root of the number 81920 | 43.430681865518 |
Recreational math for 81920
| Number 81920 reversed | 02918 |
| Sum of the digits | 20 |
| No of digits | 5 |