21007679

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{109}}^1\times {\mathrm{2503}}^1$

素因数の和:2630

約数の個数: 16

約数和(自身を含む): 26442240

約数和(自身を除く): 5434561

約数列:

[1, 7, 11, 77, 109, 763, 1199, 2503, 8393, 17521, 27533, 192731, 272827, 1909789, 3001097, 21007679]

約数ペア:

[(1, 21007679), (7, 3001097), (11, 1909789), (77, 272827), (109, 192731), (763, 27533), (1199, 17521), (2503, 8393)]