21253640

素因数分解:

$2^3\times 5^1\times {\mathrm{719}}^1\times {\mathrm{739}}^1$

素因数の和:1469

約数の個数: 32

約数和(自身を含む): 47952000

約数和(自身を除く): 26698360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 719, 739, 1438, 1478, 2876, 2956, 3595, 3695, 5752, 5912, 7190, 7390, 14380, 14780, 28760, 29560, 531341, 1062682, 2125364, 2656705, 4250728, 5313410, 10626820, 21253640]

約数ペア:

[(1, 21253640), (2, 10626820), (4, 5313410), (5, 4250728), (8, 2656705), (10, 2125364), (20, 1062682), (40, 531341), (719, 29560), (739, 28760), (1438, 14780), (1478, 14380), (2876, 7390), (2956, 7190), (3595, 5912), (3695, 5752)]