21051865

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{4673}}^1$

素因数の和:4748

約数の個数: 16

約数和(自身を含む): 27258768

約数和(自身を除く): 6206903

約数列:

[1, 5, 17, 53, 85, 265, 901, 4505, 4673, 23365, 79441, 247669, 397205, 1238345, 4210373, 21051865]

約数ペア:

[(1, 21051865), (5, 4210373), (17, 1238345), (53, 397205), (85, 247669), (265, 79441), (901, 23365), (4505, 4673)]