Compare 20981 vs 20985
| Property | 20981 | 20985 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 209811 | 31 × 51 × 13991 |
| Prime factorization | 20981 | 3 × 5 × 1399 |
| Divisors count | 2 | 8 |
| Divisors | 1, 20981 | 1, 3, 5, 15, 1399, 4197, 6995, 20985 |
| Number of properties | 5 | 0 |
| Chen primes | 1161st | |
| Good primes | 265th | |
| Primes | 2359th | |
| Pythagorean primes | 1172nd | |
| Twin primes (1st member) | 357th | |
| Roman numberals | ||
| Base 2 | 1010001111101012 | 1010001111110012 |
| Base 3 | 10012100023 | 10012100203 |
| Base 4 | 110133114 | 110133214 |
| Base 5 | 11324115 | 11324205 |
| Base 6 | 2410456 | 2410536 |
| Base 7 | 1151127 | 1151167 |
| Base 8 | 507658 | 507718 |
| Base 9 | 317029 | 317069 |
| Base 10 | 2098110 | 2098510 |
| Base 11 | 1484411 | 1484811 |
| Base 12 | 1018512 | 1018912 |
| Base 13 | 971c13 | 972313 |
| Base 14 | 790914 | 790d14 |
| Base 15 | 633b15 | 634015 |
| Base 16 | 51f516 | 51f916 |