21919807

素因数分解:

$7^2\times {\mathrm{13}}^2\times {\mathrm{2647}}^1$

素因数の和:2687

約数の個数: 18

約数和(自身を含む): 27621288

約数和(自身を除く): 5701481

約数列:

[1, 7, 13, 49, 91, 169, 637, 1183, 2647, 8281, 18529, 34411, 129703, 240877, 447343, 1686139, 3131401, 21919807]

約数ペア:

[(1, 21919807), (7, 3131401), (13, 1686139), (49, 447343), (91, 240877), (169, 129703), (637, 34411), (1183, 18529), (2647, 8281)]