20851775

素因数分解:

$5^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 32212224

約数和(自身を除く): 11360449

約数列:

[1, 5, 7, 17, 25, 35, 43, 85, 119, 163, 175, 215, 301, 425, 595, 731, 815, 1075, 1141, 1505, 2771, 2975, 3655, 4075, 5117, 5705, 7009, 7525, 13855, 18275, 19397, 25585, 28525, 35045, 49063, 69275, 96985, 119153, 127925, 175225, 245315, 484925, 595765, 834071, 1226575, 2978825, 4170355, 20851775]

約数ペア:

[(1, 20851775), (5, 4170355), (7, 2978825), (17, 1226575), (25, 834071), (35, 595765), (43, 484925), (85, 245315), (119, 175225), (163, 127925), (175, 119153), (215, 96985), (301, 69275), (425, 49063), (595, 35045), (731, 28525), (815, 25585), (1075, 19397), (1141, 18275), (1505, 13855), (2771, 7525), (2975, 7009), (3655, 5705), (4075, 5117)]