21705080

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3329}}^1$

素因数の和:3503

約数の個数: 32

約数和(自身を含む): 49150800

約数和(自身を除く): 27445720

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3260, 3329, 6520, 6658, 13316, 16645, 26632, 33290, 66580, 133160, 542627, 1085254, 2170508, 2713135, 4341016, 5426270, 10852540, 21705080]

約数ペア:

[(1, 21705080), (2, 10852540), (4, 5426270), (5, 4341016), (8, 2713135), (10, 2170508), (20, 1085254), (40, 542627), (163, 133160), (326, 66580), (652, 33290), (815, 26632), (1304, 16645), (1630, 13316), (3260, 6658), (3329, 6520)]