19908973

素因数分解:

$7^1\times {\mathrm{53}}^1\times {\mathrm{103}}^1\times {\mathrm{521}}^1$

素因数の和:684

約数の個数: 16

約数和(自身を含む): 23452416

約数和(自身を除く): 3543443

約数列:

[1, 7, 53, 103, 371, 521, 721, 3647, 5459, 27613, 38213, 53663, 193291, 375641, 2844139, 19908973]

約数ペア:

[(1, 19908973), (7, 2844139), (53, 375641), (103, 193291), (371, 53663), (521, 38213), (721, 27613), (3647, 5459)]