21049964

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{31139}}^1$

素因数の和:31169

約数の個数: 18

約数和(自身を含む): 39890340

約数和(自身を除く): 18840376

約数列:

[1, 2, 4, 13, 26, 52, 169, 338, 676, 31139, 62278, 124556, 404807, 809614, 1619228, 5262491, 10524982, 21049964]

約数ペア:

[(1, 21049964), (2, 10524982), (4, 5262491), (13, 1619228), (26, 809614), (52, 404807), (169, 124556), (338, 62278), (676, 31139)]