20490860

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1487}}^1$

素因数の和:1562

約数の個数: 48

約数和(自身を含む): 47246976

約数和(自身を除く): 26756116

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 53, 65, 106, 130, 212, 260, 265, 530, 689, 1060, 1378, 1487, 2756, 2974, 3445, 5948, 6890, 7435, 13780, 14870, 19331, 29740, 38662, 77324, 78811, 96655, 157622, 193310, 315244, 386620, 394055, 788110, 1024543, 1576220, 2049086, 4098172, 5122715, 10245430, 20490860]

約数ペア:

[(1, 20490860), (2, 10245430), (4, 5122715), (5, 4098172), (10, 2049086), (13, 1576220), (20, 1024543), (26, 788110), (52, 394055), (53, 386620), (65, 315244), (106, 193310), (130, 157622), (212, 96655), (260, 78811), (265, 77324), (530, 38662), (689, 29740), (1060, 19331), (1378, 14870), (1487, 13780), (2756, 7435), (2974, 6890), (3445, 5948)]