21798220

素因数分解:

$2^2\times 5^1\times {\mathrm{1039}}^1\times {\mathrm{1049}}^1$

素因数の和:2097

約数の個数: 24

約数和(自身を含む): 45864000

約数和(自身を除く): 24065780

約数列:

[1, 2, 4, 5, 10, 20, 1039, 1049, 2078, 2098, 4156, 4196, 5195, 5245, 10390, 10490, 20780, 20980, 1089911, 2179822, 4359644, 5449555, 10899110, 21798220]

約数ペア:

[(1, 21798220), (2, 10899110), (4, 5449555), (5, 4359644), (10, 2179822), (20, 1089911), (1039, 20980), (1049, 20780), (2078, 10490), (2098, 10390), (4156, 5245), (4196, 5195)]