21257800

素因数分解:

$2^3\times 5^2\times {\mathrm{157}}^1\times {\mathrm{677}}^1$

素因数の和:850

約数の個数: 48

約数和(自身を含む): 49812660

約数和(自身を除く): 28554860

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 157, 200, 314, 628, 677, 785, 1256, 1354, 1570, 2708, 3140, 3385, 3925, 5416, 6280, 6770, 7850, 13540, 15700, 16925, 27080, 31400, 33850, 67700, 106289, 135400, 212578, 425156, 531445, 850312, 1062890, 2125780, 2657225, 4251560, 5314450, 10628900, 21257800]

約数ペア:

[(1, 21257800), (2, 10628900), (4, 5314450), (5, 4251560), (8, 2657225), (10, 2125780), (20, 1062890), (25, 850312), (40, 531445), (50, 425156), (100, 212578), (157, 135400), (200, 106289), (314, 67700), (628, 33850), (677, 31400), (785, 27080), (1256, 16925), (1354, 15700), (1570, 13540), (2708, 7850), (3140, 6770), (3385, 6280), (3925, 5416)]