20525180

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{887}}^1$

素因数の和:998

約数の個数: 48

約数和(自身を含む): 46992960

約数和(自身を除く): 26467780

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 89, 130, 178, 260, 356, 445, 887, 890, 1157, 1774, 1780, 2314, 3548, 4435, 4628, 5785, 8870, 11531, 11570, 17740, 23062, 23140, 46124, 57655, 78943, 115310, 157886, 230620, 315772, 394715, 789430, 1026259, 1578860, 2052518, 4105036, 5131295, 10262590, 20525180]

約数ペア:

[(1, 20525180), (2, 10262590), (4, 5131295), (5, 4105036), (10, 2052518), (13, 1578860), (20, 1026259), (26, 789430), (52, 394715), (65, 315772), (89, 230620), (130, 157886), (178, 115310), (260, 78943), (356, 57655), (445, 46124), (887, 23140), (890, 23062), (1157, 17740), (1774, 11570), (1780, 11531), (2314, 8870), (3548, 5785), (4435, 4628)]