20811980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{61}}^1\times {\mathrm{2437}}^1$

素因数の和:2514

約数の個数: 48

約数和(自身を含む): 50788416

約数和(自身を除く): 29976436

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 61, 70, 122, 140, 244, 305, 427, 610, 854, 1220, 1708, 2135, 2437, 4270, 4874, 8540, 9748, 12185, 17059, 24370, 34118, 48740, 68236, 85295, 148657, 170590, 297314, 341180, 594628, 743285, 1040599, 1486570, 2081198, 2973140, 4162396, 5202995, 10405990, 20811980]

約数ペア:

[(1, 20811980), (2, 10405990), (4, 5202995), (5, 4162396), (7, 2973140), (10, 2081198), (14, 1486570), (20, 1040599), (28, 743285), (35, 594628), (61, 341180), (70, 297314), (122, 170590), (140, 148657), (244, 85295), (305, 68236), (427, 48740), (610, 34118), (854, 24370), (1220, 17059), (1708, 12185), (2135, 9748), (2437, 8540), (4270, 4874)]