18908721

素因数分解:

$3^4\times {\mathrm{13}}^1\times {\mathrm{17957}}^1$

素因数の和:17982

約数の個数: 20

約数和(自身を含む): 30420852

約数和(自身を除く): 11512131

約数列:

[1, 3, 9, 13, 27, 39, 81, 117, 351, 1053, 17957, 53871, 161613, 233441, 484839, 700323, 1454517, 2100969, 6302907, 18908721]

約数ペア:

[(1, 18908721), (3, 6302907), (9, 2100969), (13, 1454517), (27, 700323), (39, 484839), (81, 233441), (117, 161613), (351, 53871), (1053, 17957)]