20405125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{433}}^1$

素因数の和:490

約数の個数: 32

約数和(自身を含む): 28435680

約数和(自身を除く): 8030555

約数列:

[1, 5, 13, 25, 29, 65, 125, 145, 325, 377, 433, 725, 1625, 1885, 2165, 3625, 5629, 9425, 10825, 12557, 28145, 47125, 54125, 62785, 140725, 163241, 313925, 703625, 816205, 1569625, 4081025, 20405125]

約数ペア:

[(1, 20405125), (5, 4081025), (13, 1569625), (25, 816205), (29, 703625), (65, 313925), (125, 163241), (145, 140725), (325, 62785), (377, 54125), (433, 47125), (725, 28145), (1625, 12557), (1885, 10825), (2165, 9425), (3625, 5629)]