Names of 20981
| Nominal | 20981 |
| Cardinal | twenty thousand nine hundred eighty-one |
| Ordinal | 20,981st |
| This number as US currency | twenty thousand nine hundred eighty-one dollars |
| Is 20981 an odd number? | 20981 is an odd number |
| Is 20981 an even number? | 20981 is NOT an even number |
| Is 20981 a palindrome? | 20981 is NOT a palindrome number |
| Is 20981 a triangle number? | 20981 is NOT a triangle number |
20981 in other Bases
| Base 2 (Binary) | 1010001111101012 |
| Base 3 (Ternary) | 10012100023 |
| Base 4 (Quaternary) | 110133114 |
| Base 5 (Quinary) | 11324115 |
| Base 6 (Senary) | 2410456 |
| Base 8 (Octal) | 507658 |
| Base 12 (Duodecimal) | 1018512 |
| Base 16 (Hexadecimal) | 51F516 |
| Base 20 (Vigesimal) | 2C9120 |
Primes and Factors tests for 20981
| Is 20981 a Prime Number? | 20981 is a prime |
| Is 20981 a perfect number? | 20981 is NOT a perfect number |
| Is 20981 a Mersenne Prime? | 20981 is NOT a Mersenne prime |
| Is 20981 a Fermat Prime? | 20981 is NOT a Fermat prime |
| Is 20981 a Fibonacci Prime? | 20981 is NOT a Fibonacci prime |
| Is 20981 a Partition Prime? | 20981 is NOT a Partition prime |
| Is 20981 a Pell Prime? | 20981 is NOT a Pell prime |
| Prime Factors | Prime factors of 20981 |
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20981 in other Numerals
| 20981 in Roman Numeral | XXCMLXXXI |
| 20981 in Chinese Numeral | 貳萬玖佰捌拾壹 |
| 20981 in Egyptian Numeral | 𓂮𓍪𓎍𓏺 |
| 20981 in Babylonian Numeral |    |
Roots and stuff for 20981
| Is 20981 a square number? | 20981 is NOT a square number |
| Is 20981 a cube number? | 20981 is NOT a cube number |
| Square root of the number 20981 | 144.84819639885 |
| Cube root of the number 20981 | 27.580918688196 |
Recreational math for 20981
| Number 20981 reversed | 18902 |
| Sum of the digits | 20 |
| No of digits | 5 |