21191219

素因数分解:

$7^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{1571}}^1$

素因数の和:1666

約数の個数: 16

約数和(自身を含む): 25353216

約数和(自身を除く): 4161997

約数列:

[1, 7, 41, 47, 287, 329, 1571, 1927, 10997, 13489, 64411, 73837, 450877, 516859, 3027317, 21191219]

約数ペア:

[(1, 21191219), (7, 3027317), (41, 516859), (47, 450877), (287, 73837), (329, 64411), (1571, 13489), (1927, 10997)]