21778220

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{17851}}^1$

素因数の和:17921

約数の個数: 24

約数和(自身を含む): 46486608

約数和(自身を除く): 24708388

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 17851, 35702, 71404, 89255, 178510, 357020, 1088911, 2177822, 4355644, 5444555, 10889110, 21778220]

約数ペア:

[(1, 21778220), (2, 10889110), (4, 5444555), (5, 4355644), (10, 2177822), (20, 1088911), (61, 357020), (122, 178510), (244, 89255), (305, 71404), (610, 35702), (1220, 17851)]