21990800

素因数分解:

$2^4\times 5^2\times {\mathrm{13}}^1\times {\mathrm{4229}}^1$

素因数の和:4260

約数の個数: 60

約数和(自身を含む): 56910420

約数和(自身を除く): 34919620

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 40, 50, 52, 65, 80, 100, 104, 130, 200, 208, 260, 325, 400, 520, 650, 1040, 1300, 2600, 4229, 5200, 8458, 16916, 21145, 33832, 42290, 54977, 67664, 84580, 105725, 109954, 169160, 211450, 219908, 274885, 338320, 422900, 439816, 549770, 845800, 879632, 1099540, 1374425, 1691600, 2199080, 2748850, 4398160, 5497700, 10995400, 21990800]

約数ペア:

[(1, 21990800), (2, 10995400), (4, 5497700), (5, 4398160), (8, 2748850), (10, 2199080), (13, 1691600), (16, 1374425), (20, 1099540), (25, 879632), (26, 845800), (40, 549770), (50, 439816), (52, 422900), (65, 338320), (80, 274885), (100, 219908), (104, 211450), (130, 169160), (200, 109954), (208, 105725), (260, 84580), (325, 67664), (400, 54977), (520, 42290), (650, 33832), (1040, 21145), (1300, 16916), (2600, 8458), (4229, 5200)]