20780919

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{1913}}^1$

素因数の和:2007

約数の個数: 24

約数和(自身を含む): 32247072

約数和(自身を除く): 11466153

約数列:

[1, 3, 9, 17, 51, 71, 153, 213, 639, 1207, 1913, 3621, 5739, 10863, 17217, 32521, 97563, 135823, 292689, 407469, 1222407, 2308991, 6926973, 20780919]

約数ペア:

[(1, 20780919), (3, 6926973), (9, 2308991), (17, 1222407), (51, 407469), (71, 292689), (153, 135823), (213, 97563), (639, 32521), (1207, 17217), (1913, 10863), (3621, 5739)]