19915225

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{521}}^1$

素因数の和:681

約数の個数: 24

約数和(自身を含む): 27185760

約数和(自身を除く): 7270535

約数列:

[1, 5, 11, 25, 55, 139, 275, 521, 695, 1529, 2605, 3475, 5731, 7645, 13025, 28655, 38225, 72419, 143275, 362095, 796609, 1810475, 3983045, 19915225]

約数ペア:

[(1, 19915225), (5, 3983045), (11, 1810475), (25, 796609), (55, 362095), (139, 143275), (275, 72419), (521, 38225), (695, 28655), (1529, 13025), (2605, 7645), (3475, 5731)]