21017925

素因数分解:

$3^2\times 5^2\times {\mathrm{109}}^1\times {\mathrm{857}}^1$

素因数の和:982

約数の個数: 36

約数和(自身を含む): 38035140

約数和(自身を除く): 17017215

約数列:

[1, 3, 5, 9, 15, 25, 45, 75, 109, 225, 327, 545, 857, 981, 1635, 2571, 2725, 4285, 4905, 7713, 8175, 12855, 21425, 24525, 38565, 64275, 93413, 192825, 280239, 467065, 840717, 1401195, 2335325, 4203585, 7005975, 21017925]

約数ペア:

[(1, 21017925), (3, 7005975), (5, 4203585), (9, 2335325), (15, 1401195), (25, 840717), (45, 467065), (75, 280239), (109, 192825), (225, 93413), (327, 64275), (545, 38565), (857, 24525), (981, 21425), (1635, 12855), (2571, 8175), (2725, 7713), (4285, 4905)]