18669721

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{1901}}^1$

素因数の和:1992

約数の個数: 16

約数和(自身を含む): 22641408

約数和(自身を除く): 3971687

約数列:

[1, 7, 23, 61, 161, 427, 1403, 1901, 9821, 13307, 43723, 115961, 306061, 811727, 2667103, 18669721]

約数ペア:

[(1, 18669721), (7, 2667103), (23, 811727), (61, 306061), (161, 115961), (427, 43723), (1403, 13307), (1901, 9821)]