20790220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^4\times {\mathrm{71}}^1$

素因数の和:124

約数の個数: 60

約数和(自身を含む): 48701520

約数和(自身を除く): 27911300

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 71, 110, 121, 142, 220, 242, 284, 355, 484, 605, 710, 781, 1210, 1331, 1420, 1562, 2420, 2662, 3124, 3905, 5324, 6655, 7810, 8591, 13310, 14641, 15620, 17182, 26620, 29282, 34364, 42955, 58564, 73205, 85910, 94501, 146410, 171820, 189002, 292820, 378004, 472505, 945010, 1039511, 1890020, 2079022, 4158044, 5197555, 10395110, 20790220]

約数ペア:

[(1, 20790220), (2, 10395110), (4, 5197555), (5, 4158044), (10, 2079022), (11, 1890020), (20, 1039511), (22, 945010), (44, 472505), (55, 378004), (71, 292820), (110, 189002), (121, 171820), (142, 146410), (220, 94501), (242, 85910), (284, 73205), (355, 58564), (484, 42955), (605, 34364), (710, 29282), (781, 26620), (1210, 17182), (1331, 15620), (1420, 14641), (1562, 13310), (2420, 8591), (2662, 7810), (3124, 6655), (3905, 5324)]