20639801

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{73}}^1\times {\mathrm{239}}^1$

素因数の和:345

約数の個数: 24

約数和(自身を含む): 26000640

約数和(自身を除く): 5360839

約数列:

[1, 7, 13, 73, 91, 169, 239, 511, 949, 1183, 1673, 3107, 6643, 12337, 17447, 21749, 40391, 86359, 122129, 226811, 282737, 1587677, 2948543, 20639801]

約数ペア:

[(1, 20639801), (7, 2948543), (13, 1587677), (73, 282737), (91, 226811), (169, 122129), (239, 86359), (511, 40391), (949, 21749), (1183, 17447), (1673, 12337), (3107, 6643)]