20391025

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{317}}^1$

素因数の和:441

約数の個数: 24

約数和(自身を含む): 26498304

約数和(自身を除く): 6107279

約数列:

[1, 5, 25, 31, 83, 155, 317, 415, 775, 1585, 2075, 2573, 7925, 9827, 12865, 26311, 49135, 64325, 131555, 245675, 657775, 815641, 4078205, 20391025]

約数ペア:

[(1, 20391025), (5, 4078205), (25, 815641), (31, 657775), (83, 245675), (155, 131555), (317, 64325), (415, 49135), (775, 26311), (1585, 12865), (2075, 9827), (2573, 7925)]