18720387

素因数分解:

$3^2\times 7^1\times {\mathrm{163}}^1\times {\mathrm{1823}}^1$

素因数の和:1999

約数の個数: 24

約数和(自身を含む): 31110144

約数和(自身を除く): 12389757

約数列:

[1, 3, 7, 9, 21, 63, 163, 489, 1141, 1467, 1823, 3423, 5469, 10269, 12761, 16407, 38283, 114849, 297149, 891447, 2080043, 2674341, 6240129, 18720387]

約数ペア:

[(1, 18720387), (3, 6240129), (7, 2674341), (9, 2080043), (21, 891447), (63, 297149), (163, 114849), (489, 38283), (1141, 16407), (1467, 12761), (1823, 10269), (3423, 5469)]