21215960

素因数分解:

$2^3\times 5^1\times {\mathrm{107}}^1\times {\mathrm{4957}}^1$

素因数の和:5075

約数の個数: 32

約数和(自身を含む): 48191760

約数和(自身を除く): 26975800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 107, 214, 428, 535, 856, 1070, 2140, 4280, 4957, 9914, 19828, 24785, 39656, 49570, 99140, 198280, 530399, 1060798, 2121596, 2651995, 4243192, 5303990, 10607980, 21215960]

約数ペア:

[(1, 21215960), (2, 10607980), (4, 5303990), (5, 4243192), (8, 2651995), (10, 2121596), (20, 1060798), (40, 530399), (107, 198280), (214, 99140), (428, 49570), (535, 39656), (856, 24785), (1070, 19828), (2140, 9914), (4280, 4957)]