21068719

素因数分解:

$7^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1\times {\mathrm{521}}^1$

素因数の和:690

約数の個数: 16

約数和(自身を含む): 24805440

約数和(自身を除く): 3736721

約数列:

[1, 7, 53, 109, 371, 521, 763, 3647, 5777, 27613, 40439, 56789, 193291, 397523, 3009817, 21068719]

約数ペア:

[(1, 21068719), (7, 3009817), (53, 397523), (109, 193291), (371, 56789), (521, 40439), (763, 27613), (3647, 5777)]