21688040

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4481}}^1$

素因数の和:4514

約数の個数: 48

約数和(自身を含む): 53649540

約数和(自身を除く): 31961500

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 4481, 4840, 8962, 17924, 22405, 35848, 44810, 49291, 89620, 98582, 179240, 197164, 246455, 394328, 492910, 542201, 985820, 1084402, 1971640, 2168804, 2711005, 4337608, 5422010, 10844020, 21688040]

約数ペア:

[(1, 21688040), (2, 10844020), (4, 5422010), (5, 4337608), (8, 2711005), (10, 2168804), (11, 1971640), (20, 1084402), (22, 985820), (40, 542201), (44, 492910), (55, 394328), (88, 246455), (110, 197164), (121, 179240), (220, 98582), (242, 89620), (440, 49291), (484, 44810), (605, 35848), (968, 22405), (1210, 17924), (2420, 8962), (4481, 4840)]