21108915

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{10909}}^1$

素因数の和:10963

約数の個数: 24

約数和(自身を含む): 37443120

約数和(自身を除く): 16334205

約数列:

[1, 3, 5, 9, 15, 43, 45, 129, 215, 387, 645, 1935, 10909, 32727, 54545, 98181, 163635, 469087, 490905, 1407261, 2345435, 4221783, 7036305, 21108915]

約数ペア:

[(1, 21108915), (3, 7036305), (5, 4221783), (9, 2345435), (15, 1407261), (43, 490905), (45, 469087), (129, 163635), (215, 98181), (387, 54545), (645, 32727), (1935, 10909)]