20405260

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5179}}^1$

素因数の和:5385

約数の個数: 24

約数和(自身を含む): 43076880

約数和(自身を除く): 22671620

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5179, 10358, 20716, 25895, 51790, 103580, 1020263, 2040526, 4081052, 5101315, 10202630, 20405260]

約数ペア:

[(1, 20405260), (2, 10202630), (4, 5101315), (5, 4081052), (10, 2040526), (20, 1020263), (197, 103580), (394, 51790), (788, 25895), (985, 20716), (1970, 10358), (3940, 5179)]