128807721

素因数分解:

$3^2\times 7^2\times {\mathrm{292081}}^1$

素因数の和:292101

約数の個数: 18

約数和(自身を含む): 216432762

約数和(自身を除く): 87625041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 292081, 876243, 2044567, 2628729, 6133701, 14311969, 18401103, 42935907, 128807721]

約数ペア:

[(1, 128807721), (3, 42935907), (7, 18401103), (9, 14311969), (21, 6133701), (49, 2628729), (63, 2044567), (147, 876243), (441, 292081)]