21123655

素因数分解:

$5^1\times 7^3\times {\mathrm{109}}^1\times {\mathrm{113}}^1$

素因数の和:248

約数の個数: 32

約数和(自身を含む): 30096000

約数和(自身を除く): 8972345

約数列:

[1, 5, 7, 35, 49, 109, 113, 245, 343, 545, 565, 763, 791, 1715, 3815, 3955, 5341, 5537, 12317, 26705, 27685, 37387, 38759, 61585, 86219, 186935, 193795, 431095, 603533, 3017665, 4224731, 21123655]

約数ペア:

[(1, 21123655), (5, 4224731), (7, 3017665), (35, 603533), (49, 431095), (109, 193795), (113, 186935), (245, 86219), (343, 61585), (545, 38759), (565, 37387), (763, 27685), (791, 26705), (1715, 12317), (3815, 5537), (3955, 5341)]