Compare 20639 vs 20645
| Property | 20639 | 20645 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 206391 | 51 × 41291 |
| Prime factorization | 20639 | 5 × 4129 |
| Divisors count | 2 | 4 |
| Divisors | 1, 20639 | 1, 5, 4129, 20645 |
| Number of properties | 4 | 1 |
| Chen primes | 1143rd | |
| Happy primes | 384th | |
| Primes | 2326th | |
| Semiprimes | 5240th | |
| Twin primes (1st member) | 351st | |
| Roman numberals | ||
| Base 2 | 1010000100111112 | 1010000101001012 |
| Base 3 | 10010221023 | 10010221223 |
| Base 4 | 110021334 | 110022114 |
| Base 5 | 11300245 | 11300405 |
| Base 6 | 2353156 | 2353256 |
| Base 7 | 1141137 | 1141227 |
| Base 8 | 502378 | 502458 |
| Base 9 | 312729 | 312789 |
| Base 10 | 2063910 | 2064510 |
| Base 11 | 1456311 | 1456911 |
| Base 12 | bb3b12 | bb4512 |
| Base 13 | 951813 | 952113 |
| Base 14 | 774314 | 774914 |
| Base 15 | 61ae15 | 61b515 |
| Base 16 | 509f16 | 50a516 |