20391721

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{349}}^1\times {\mathrm{491}}^1$

素因数の和:864

約数の個数: 16

約数和(自身を含む): 24796800

約数和(自身を除く): 4405079

約数列:

[1, 7, 17, 119, 349, 491, 2443, 3437, 5933, 8347, 41531, 58429, 171359, 1199513, 2913103, 20391721]

約数ペア:

[(1, 20391721), (7, 2913103), (17, 1199513), (119, 171359), (349, 58429), (491, 41531), (2443, 8347), (3437, 5933)]