21157810

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{131}}^1\times {\mathrm{521}}^1$

素因数の和:690

約数の個数: 32

約数和(自身を含む): 39688704

約数和(自身を除く): 18530894

約数列:

[1, 2, 5, 10, 31, 62, 131, 155, 262, 310, 521, 655, 1042, 1310, 2605, 4061, 5210, 8122, 16151, 20305, 32302, 40610, 68251, 80755, 136502, 161510, 341255, 682510, 2115781, 4231562, 10578905, 21157810]

約数ペア:

[(1, 21157810), (2, 10578905), (5, 4231562), (10, 2115781), (31, 682510), (62, 341255), (131, 161510), (155, 136502), (262, 80755), (310, 68251), (521, 40610), (655, 32302), (1042, 20305), (1310, 16151), (2605, 8122), (4061, 5210)]