21905149

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{139}}^1\times {\mathrm{479}}^1$

素因数の和:672

約数の個数: 16

約数和(自身を含む): 25804800

約数和(自身を除く): 3899651

約数列:

[1, 7, 47, 139, 329, 479, 973, 3353, 6533, 22513, 45731, 66581, 157591, 466067, 3129307, 21905149]

約数ペア:

[(1, 21905149), (7, 3129307), (47, 466067), (139, 157591), (329, 66581), (479, 45731), (973, 22513), (3353, 6533)]