20925125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{163}}^1$

素因数の和:270

約数の個数: 32

約数和(自身を含む): 28654080

約数和(自身を除く): 7728955

約数列:

[1, 5, 13, 25, 65, 79, 125, 163, 325, 395, 815, 1027, 1625, 1975, 2119, 4075, 5135, 9875, 10595, 12877, 20375, 25675, 52975, 64385, 128375, 167401, 264875, 321925, 837005, 1609625, 4185025, 20925125]

約数ペア:

[(1, 20925125), (5, 4185025), (13, 1609625), (25, 837005), (65, 321925), (79, 264875), (125, 167401), (163, 128375), (325, 64385), (395, 52975), (815, 25675), (1027, 20375), (1625, 12877), (1975, 10595), (2119, 9875), (4075, 5135)]