20789375

素因数分解:

$5^4\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1$

素因数の和:117

約数の個数: 40

約数和(自身を含む): 28490880

約数和(自身を除く): 7701505

約数列:

[1, 5, 25, 29, 31, 37, 125, 145, 155, 185, 625, 725, 775, 899, 925, 1073, 1147, 3625, 3875, 4495, 4625, 5365, 5735, 18125, 19375, 22475, 23125, 26825, 28675, 33263, 112375, 134125, 143375, 166315, 561875, 670625, 716875, 831575, 4157875, 20789375]

約数ペア:

[(1, 20789375), (5, 4157875), (25, 831575), (29, 716875), (31, 670625), (37, 561875), (125, 166315), (145, 143375), (155, 134125), (185, 112375), (625, 33263), (725, 28675), (775, 26825), (899, 23125), (925, 22475), (1073, 19375), (1147, 18125), (3625, 5735), (3875, 5365), (4495, 4625)]