Compare 15 vs 30
| Property | 15 | 30 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 3 |
| Prime factorization | 31 × 51 | 21 × 31 × 51 |
| Prime factorization | 3 × 5 | 2 × 3 × 5 |
| Divisors count | 4 | 8 |
| Divisors | 1, 3, 5, 15 | 1, 2, 3, 5, 6, 10, 15, 30 |
| Number of properties | 1 | 0 |
| Semiprimes | 6th | |
| Roman numberals | XV | XXX |
| Base 2 | 11112 | 111102 |
| Base 3 | 1203 | 10103 |
| Base 4 | 334 | 1324 |
| Base 5 | 305 | 1105 |
| Base 6 | 236 | 506 |
| Base 7 | 217 | 427 |
| Base 8 | 178 | 368 |
| Base 9 | 169 | 339 |
| Base 10 | 1510 | 3010 |
| Base 11 | 1411 | 2811 |
| Base 12 | 1312 | 2612 |
| Base 13 | 1213 | 2413 |
| Base 14 | 1114 | 2214 |
| Base 15 | 1015 | 2015 |
| Base 16 | f16 | 1e16 |