Compare 4 vs 15
| Property | 4 | 15 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 22 | 31 × 51 |
| Prime factorization | 2 × 2 | 3 × 5 |
| Divisors count | 3 | 4 |
| Divisors | 1, 2, 4 | 1, 3, 5, 15 |
| Number of properties | 1 | 1 |
| Semiprimes | 1st | 6th |
| Roman numberals | IV | XV |
| Base 2 | 1002 | 11112 |
| Base 3 | 113 | 1203 |
| Base 4 | 104 | 334 |
| Base 5 | 45 | 305 |
| Base 6 | 46 | 236 |
| Base 7 | 47 | 217 |
| Base 8 | 48 | 178 |
| Base 9 | 49 | 169 |
| Base 10 | 410 | 1510 |
| Base 11 | 411 | 1411 |
| Base 12 | 412 | 1312 |
| Base 13 | 413 | 1213 |
| Base 14 | 414 | 1114 |
| Base 15 | 415 | 1015 |
| Base 16 | 416 | f16 |