21906625

素因数分解:

$5^3\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{61}}^1$

素因数の和:119

約数の個数: 48

約数和(自身を含む): 31859568

約数和(自身を除く): 9952943

約数列:

[1, 5, 13, 17, 25, 61, 65, 85, 125, 169, 221, 305, 325, 425, 793, 845, 1037, 1105, 1525, 1625, 2125, 2873, 3965, 4225, 5185, 5525, 7625, 10309, 13481, 14365, 19825, 21125, 25925, 27625, 51545, 67405, 71825, 99125, 129625, 175253, 257725, 337025, 359125, 876265, 1288625, 1685125, 4381325, 21906625]

約数ペア:

[(1, 21906625), (5, 4381325), (13, 1685125), (17, 1288625), (25, 876265), (61, 359125), (65, 337025), (85, 257725), (125, 175253), (169, 129625), (221, 99125), (305, 71825), (325, 67405), (425, 51545), (793, 27625), (845, 25925), (1037, 21125), (1105, 19825), (1525, 14365), (1625, 13481), (2125, 10309), (2873, 7625), (3965, 5525), (4225, 5185)]