21261785

素因数分解:

$5^1\times {\mathrm{29}}^1\times {\mathrm{331}}^1\times {\mathrm{443}}^1$

素因数の和:808

約数の個数: 16

約数和(自身を含む): 26533440

約数和(自身を除く): 5271655

約数列:

[1, 5, 29, 145, 331, 443, 1655, 2215, 9599, 12847, 47995, 64235, 146633, 733165, 4252357, 21261785]

約数ペア:

[(1, 21261785), (5, 4252357), (29, 733165), (145, 146633), (331, 64235), (443, 47995), (1655, 12847), (2215, 9599)]