Compare 20 vs 43
| Property | 20 | 43 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 2 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 22 × 51 | 431 |
| Prime factorization | 2 × 2 × 5 | 43 |
| Divisors count | 6 | 2 |
| Divisors | 1, 2, 4, 5, 10, 20 | 1, 43 |
| Number of properties | 0 | 12 |
| Additive primes | 9th | |
| Centered heptagonal primes | 1st | |
| Cousin primes (1st member) | 6th | |
| Left-truncatable primes | 9th | |
| Lucky primes | 6th | |
| Primes | 14th | |
| Prime triplets (2nd member) | 7th | |
| Prime triplets (3rd member) | 6th | |
| Sexy primes (2nd member) | 8th | |
| Sexy prime triplets (3rd member) | 5th | |
| Twin primes (2nd member) | 6th | |
| Wagstaff primes | 3rd | |
| Roman numberals | XX | XLIII |
| Base 2 | 101002 | 1010112 |
| Base 3 | 2023 | 11213 |
| Base 4 | 1104 | 2234 |
| Base 5 | 405 | 1335 |
| Base 6 | 326 | 1116 |
| Base 7 | 267 | 617 |
| Base 8 | 248 | 538 |
| Base 9 | 229 | 479 |
| Base 10 | 2010 | 4310 |
| Base 11 | 1911 | 3a11 |
| Base 12 | 1812 | 3712 |
| Base 13 | 1713 | 3413 |
| Base 14 | 1614 | 3114 |
| Base 15 | 1515 | 2d15 |
| Base 16 | 1416 | 2b16 |