21878857

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^1\times {\mathrm{1987}}^1$

素因数の和:2029

約数の個数: 24

約数和(自身を含む): 29613248

約数和(自身を除く): 7734391

約数列:

[1, 7, 11, 13, 77, 91, 121, 143, 847, 1001, 1573, 1987, 11011, 13909, 21857, 25831, 152999, 180817, 240427, 284141, 1682989, 1988987, 3125551, 21878857]

約数ペア:

[(1, 21878857), (7, 3125551), (11, 1988987), (13, 1682989), (77, 284141), (91, 240427), (121, 180817), (143, 152999), (847, 25831), (1001, 21857), (1573, 13909), (1987, 11011)]