21031075

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{397}}^1$

素因数の和:583

約数の個数: 24

約数和(自身を含む): 28328048

約数和(自身を除く): 7296973

約数列:

[1, 5, 13, 25, 65, 163, 325, 397, 815, 1985, 2119, 4075, 5161, 9925, 10595, 25805, 52975, 64711, 129025, 323555, 841243, 1617775, 4206215, 21031075]

約数ペア:

[(1, 21031075), (5, 4206215), (13, 1617775), (25, 841243), (65, 323555), (163, 129025), (325, 64711), (397, 52975), (815, 25805), (1985, 10595), (2119, 9925), (4075, 5161)]