20408375

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{661}}^1$

素因数の和:708

約数の個数: 32

約数和(自身を含む): 28916160

約数和(自身を除く): 8507785

約数列:

[1, 5, 13, 19, 25, 65, 95, 125, 247, 325, 475, 661, 1235, 1625, 2375, 3305, 6175, 8593, 12559, 16525, 30875, 42965, 62795, 82625, 163267, 214825, 313975, 816335, 1074125, 1569875, 4081675, 20408375]

約数ペア:

[(1, 20408375), (5, 4081675), (13, 1569875), (19, 1074125), (25, 816335), (65, 313975), (95, 214825), (125, 163267), (247, 82625), (325, 62795), (475, 42965), (661, 30875), (1235, 16525), (1625, 12559), (2375, 8593), (3305, 6175)]