128765721

素因数分解:

$3^1\times 7^1\times {\mathrm{281}}^1\times {\mathrm{21821}}^1$

素因数の和:22112

約数の個数: 16

約数和(自身を含む): 196921728

約数和(自身を除く): 68156007

約数列:

[1, 3, 7, 21, 281, 843, 1967, 5901, 21821, 65463, 152747, 458241, 6131701, 18395103, 42921907, 128765721]

約数ペア:

[(1, 128765721), (3, 42921907), (7, 18395103), (21, 6131701), (281, 458241), (843, 152747), (1967, 65463), (5901, 21821)]