21112975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{167}}^1\times {\mathrm{389}}^1$

素因数の和:579

約数の個数: 24

約数和(自身を含む): 28435680

約数和(自身を除く): 7322705

約数列:

[1, 5, 13, 25, 65, 167, 325, 389, 835, 1945, 2171, 4175, 5057, 9725, 10855, 25285, 54275, 64963, 126425, 324815, 844519, 1624075, 4222595, 21112975]

約数ペア:

[(1, 21112975), (5, 4222595), (13, 1624075), (25, 844519), (65, 324815), (167, 126425), (325, 64963), (389, 54275), (835, 25285), (1945, 10855), (2171, 9725), (4175, 5057)]