Compare 20990 vs 21001
| Property | 20990 | 21001 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 21 × 51 × 20991 | 210011 |
| Prime factorization | 2 × 5 × 2099 | 21001 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 5, 10, 2099, 4198, 10495, 20990 | 1, 21001 |
| Number of properties | 0 | 5 |
| Chen primes | 1162nd | |
| Harmonic primes | 867th | |
| Isolated primes | 1648th | |
| Primes | 2361st | |
| Pythagorean primes | 1173rd | |
| Roman numberals | ||
| Base 2 | 1010001111111102 | 1010010000010012 |
| Base 3 | 10012101023 | 10012102113 |
| Base 4 | 110133324 | 110200214 |
| Base 5 | 11324305 | 11330015 |
| Base 6 | 2411026 | 2411216 |
| Base 7 | 1151247 | 1151417 |
| Base 8 | 507768 | 510118 |
| Base 9 | 317129 | 317249 |
| Base 10 | 2099010 | 2100110 |
| Base 11 | 1485211 | 1486211 |
| Base 12 | 1019212 | 101a112 |
| Base 13 | 972813 | 973613 |
| Base 14 | 791414 | 792114 |
| Base 15 | 634515 | 635115 |
| Base 16 | 51fe16 | 520916 |