21281870

素因数分解:

$2^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{51907}}^1$

素因数の和:51955

約数の個数: 16

約数和(自身を含む): 39242448

約数和(自身を除く): 17960578

約数列:

[1, 2, 5, 10, 41, 82, 205, 410, 51907, 103814, 259535, 519070, 2128187, 4256374, 10640935, 21281870]

約数ペア:

[(1, 21281870), (2, 10640935), (5, 4256374), (10, 2128187), (41, 519070), (82, 259535), (205, 103814), (410, 51907)]