21787381

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{29}}^1\times {\mathrm{887}}^1$

素因数の和:945

約数の個数: 24

約数和(自身を含む): 28344960

約数和(自身を除く): 6557579

約数列:

[1, 7, 11, 29, 77, 121, 203, 319, 847, 887, 2233, 3509, 6209, 9757, 24563, 25723, 68299, 107327, 180061, 282953, 751289, 1980671, 3112483, 21787381]

約数ペア:

[(1, 21787381), (7, 3112483), (11, 1980671), (29, 751289), (77, 282953), (121, 180061), (203, 107327), (319, 68299), (847, 25723), (887, 24563), (2233, 9757), (3509, 6209)]