20891521

素因数分解:

$7^1\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{449}}^1$

素因数の和:513

約数の個数: 24

約数和(自身を含む): 26524800

約数和(自身を除く): 5633279

約数列:

[1, 7, 17, 23, 119, 161, 289, 391, 449, 2023, 2737, 3143, 6647, 7633, 10327, 46529, 53431, 72289, 129761, 175559, 908327, 1228913, 2984503, 20891521]

約数ペア:

[(1, 20891521), (7, 2984503), (17, 1228913), (23, 908327), (119, 175559), (161, 129761), (289, 72289), (391, 53431), (449, 46529), (2023, 10327), (2737, 7633), (3143, 6647)]