21421780

素因数分解:

$2^2\times 5^1\times {\mathrm{197}}^1\times {\mathrm{5437}}^1$

素因数の和:5643

約数の個数: 24

約数和(自身を含む): 45222408

約数和(自身を除く): 23800628

約数列:

[1, 2, 4, 5, 10, 20, 197, 394, 788, 985, 1970, 3940, 5437, 10874, 21748, 27185, 54370, 108740, 1071089, 2142178, 4284356, 5355445, 10710890, 21421780]

約数ペア:

[(1, 21421780), (2, 10710890), (4, 5355445), (5, 4284356), (10, 2142178), (20, 1071089), (197, 108740), (394, 54370), (788, 27185), (985, 21748), (1970, 10874), (3940, 5437)]