20028125

素因数分解:

$5^5\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1$

素因数の和:84

約数の個数: 48

約数和(自身を含む): 29529360

約数和(自身を除く): 9501235

約数列:

[1, 5, 13, 17, 25, 29, 65, 85, 125, 145, 221, 325, 377, 425, 493, 625, 725, 1105, 1625, 1885, 2125, 2465, 3125, 3625, 5525, 6409, 8125, 9425, 10625, 12325, 18125, 27625, 32045, 40625, 47125, 53125, 61625, 90625, 138125, 160225, 235625, 308125, 690625, 801125, 1178125, 1540625, 4005625, 20028125]

約数ペア:

[(1, 20028125), (5, 4005625), (13, 1540625), (17, 1178125), (25, 801125), (29, 690625), (65, 308125), (85, 235625), (125, 160225), (145, 138125), (221, 90625), (325, 61625), (377, 53125), (425, 47125), (493, 40625), (625, 32045), (725, 27625), (1105, 18125), (1625, 12325), (1885, 10625), (2125, 9425), (2465, 8125), (3125, 6409), (3625, 5525)]