Compare 20639 vs 20640
| Property | 20639 | 20640 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 4 |
| Total factors | 1 | 8 |
| Prime factorization | 206391 | 25 × 31 × 51 × 431 |
| Prime factorization | 20639 | 2 × 2 × 2 × 2 × 2 × 3 × 5 × 43 |
| Divisors count | 2 | 48 |
| Divisors | 1, 20639 | 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 43, 48, 60, 80, 86, 96, 120, 129, 160, 172, 215, 240, 258, 344, 430, 480, 516, 645, 688, 860, 1032, 1290, 1376, 1720, 2064, 2580, 3440, 4128, 5160, 6880, 10320, 20640 |
| Number of properties | 4 | 0 |
| Chen primes | 1143rd | |
| Happy primes | 384th | |
| Primes | 2326th | |
| Twin primes (1st member) | 351st | |
| Roman numberals | ||
| Base 2 | 1010000100111112 | 1010000101000002 |
| Base 3 | 10010221023 | 10010221103 |
| Base 4 | 110021334 | 110022004 |
| Base 5 | 11300245 | 11300305 |
| Base 6 | 2353156 | 2353206 |
| Base 7 | 1141137 | 1141147 |
| Base 8 | 502378 | 502408 |
| Base 9 | 312729 | 312739 |
| Base 10 | 2063910 | 2064010 |
| Base 11 | 1456311 | 1456411 |
| Base 12 | bb3b12 | bb4012 |
| Base 13 | 951813 | 951913 |
| Base 14 | 774314 | 774414 |
| Base 15 | 61ae15 | 61b015 |
| Base 16 | 509f16 | 50a016 |