21240405

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{12757}}^1$

素因数の和:12805

約数の個数: 24

約数和(自身を含む): 37814712

約数和(自身を除く): 16574307

約数列:

[1, 3, 5, 9, 15, 37, 45, 111, 185, 333, 555, 1665, 12757, 38271, 63785, 114813, 191355, 472009, 574065, 1416027, 2360045, 4248081, 7080135, 21240405]

約数ペア:

[(1, 21240405), (3, 7080135), (5, 4248081), (9, 2360045), (15, 1416027), (37, 574065), (45, 472009), (111, 191355), (185, 114813), (333, 63785), (555, 38271), (1665, 12757)]