18720891999

素因数分解:

$3^2\times {\mathrm{103}}^1\times {\mathrm{20195137}}^1$

素因数の和:20195246

約数の個数: 12

約数和(自身を含む): 27303826576

約数和(自身を除く): 8582934577

約数列:

[1, 3, 9, 103, 309, 927, 20195137, 60585411, 181756233, 2080099111, 6240297333, 18720891999]

約数ペア:

[(1, 18720891999), (3, 6240297333), (9, 2080099111), (103, 181756233), (309, 60585411), (927, 20195137)]