21891025

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{193}}^1\times {\mathrm{349}}^1$

素因数の和:565

約数の個数: 24

約数和(自身を含む): 29468600

約数和(自身を除く): 7577575

約数列:

[1, 5, 13, 25, 65, 193, 325, 349, 965, 1745, 2509, 4537, 4825, 8725, 12545, 22685, 62725, 67357, 113425, 336785, 875641, 1683925, 4378205, 21891025]

約数ペア:

[(1, 21891025), (5, 4378205), (13, 1683925), (25, 875641), (65, 336785), (193, 113425), (325, 67357), (349, 62725), (965, 22685), (1745, 12545), (2509, 8725), (4537, 4825)]