21289765

素因数分解:

$5^1\times 7^2\times {\mathrm{113}}^1\times {\mathrm{769}}^1$

素因数の和:901

約数の個数: 24

約数和(自身を含む): 30020760

約数和(自身を除く): 8730995

約数列:

[1, 5, 7, 35, 49, 113, 245, 565, 769, 791, 3845, 3955, 5383, 5537, 26915, 27685, 37681, 86897, 188405, 434485, 608279, 3041395, 4257953, 21289765]

約数ペア:

[(1, 21289765), (5, 4257953), (7, 3041395), (35, 608279), (49, 434485), (113, 188405), (245, 86897), (565, 37681), (769, 27685), (791, 26915), (3845, 5537), (3955, 5383)]