21145875

素因数分解:

$3^1\times 5^3\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{107}}^1$

素因数の和:173

約数の個数: 64

約数和(自身を含む): 38817792

約数和(自身を除く): 17671917

約数列:

[1, 3, 5, 15, 17, 25, 31, 51, 75, 85, 93, 107, 125, 155, 255, 321, 375, 425, 465, 527, 535, 775, 1275, 1581, 1605, 1819, 2125, 2325, 2635, 2675, 3317, 3875, 5457, 6375, 7905, 8025, 9095, 9951, 11625, 13175, 13375, 16585, 27285, 39525, 40125, 45475, 49755, 56389, 65875, 82925, 136425, 169167, 197625, 227375, 248775, 281945, 414625, 682125, 845835, 1243875, 1409725, 4229175, 7048625, 21145875]

約数ペア:

[(1, 21145875), (3, 7048625), (5, 4229175), (15, 1409725), (17, 1243875), (25, 845835), (31, 682125), (51, 414625), (75, 281945), (85, 248775), (93, 227375), (107, 197625), (125, 169167), (155, 136425), (255, 82925), (321, 65875), (375, 56389), (425, 49755), (465, 45475), (527, 40125), (535, 39525), (775, 27285), (1275, 16585), (1581, 13375), (1605, 13175), (1819, 11625), (2125, 9951), (2325, 9095), (2635, 8025), (2675, 7905), (3317, 6375), (3875, 5457)]