21118665

素因数分解:

$3^1\times 5^1\times {\mathrm{401}}^1\times {\mathrm{3511}}^1$

素因数の和:3920

約数の個数: 16

約数和(自身を含む): 33883776

約数和(自身を除く): 12765111

約数列:

[1, 3, 5, 15, 401, 1203, 2005, 3511, 6015, 10533, 17555, 52665, 1407911, 4223733, 7039555, 21118665]

約数ペア:

[(1, 21118665), (3, 7039555), (5, 4223733), (15, 1407911), (401, 52665), (1203, 17555), (2005, 10533), (3511, 6015)]