21168820

素因数分解:

$2^2\times 5^1\times {\mathrm{1009}}^1\times {\mathrm{1049}}^1$

素因数の和:2067

約数の個数: 24

約数和(自身を含む): 44541000

約数和(自身を除く): 23372180

約数列:

[1, 2, 4, 5, 10, 20, 1009, 1049, 2018, 2098, 4036, 4196, 5045, 5245, 10090, 10490, 20180, 20980, 1058441, 2116882, 4233764, 5292205, 10584410, 21168820]

約数ペア:

[(1, 21168820), (2, 10584410), (4, 5292205), (5, 4233764), (10, 2116882), (20, 1058441), (1009, 20980), (1049, 20180), (2018, 10490), (2098, 10090), (4036, 5245), (4196, 5045)]