Compare 20981 vs 20993
| Property | 20981 | 20993 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 209811 | 71 × 29991 |
| Prime factorization | 20981 | 7 × 2999 |
| Divisors count | 2 | 4 |
| Divisors | 1, 20981 | 1, 7, 2999, 20993 |
| Number of properties | 5 | 1 |
| Chen primes | 1161st | |
| Good primes | 265th | |
| Primes | 2359th | |
| Pythagorean primes | 1172nd | |
| Semiprimes | 5326th | |
| Twin primes (1st member) | 357th | |
| Roman numberals | ||
| Base 2 | 1010001111101012 | 1010010000000012 |
| Base 3 | 10012100023 | 10012101123 |
| Base 4 | 110133114 | 110200014 |
| Base 5 | 11324115 | 11324335 |
| Base 6 | 2410456 | 2411056 |
| Base 7 | 1151127 | 1151307 |
| Base 8 | 507658 | 510018 |
| Base 9 | 317029 | 317159 |
| Base 10 | 2098110 | 2099310 |
| Base 11 | 1484411 | 1485511 |
| Base 12 | 1018512 | 1019512 |
| Base 13 | 971c13 | 972b13 |
| Base 14 | 790914 | 791714 |
| Base 15 | 633b15 | 634815 |
| Base 16 | 51f516 | 520116 |