25728440

素因数分解:

$2^3\times 5^1\times {\mathrm{499}}^1\times {\mathrm{1289}}^1$

素因数の和:1799

約数の個数: 32

約数和(自身を含む): 58050000

約数和(自身を除く): 32321560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499, 998, 1289, 1996, 2495, 2578, 3992, 4990, 5156, 6445, 9980, 10312, 12890, 19960, 25780, 51560, 643211, 1286422, 2572844, 3216055, 5145688, 6432110, 12864220, 25728440]

約数ペア:

[(1, 25728440), (2, 12864220), (4, 6432110), (5, 5145688), (8, 3216055), (10, 2572844), (20, 1286422), (40, 643211), (499, 51560), (998, 25780), (1289, 19960), (1996, 12890), (2495, 10312), (2578, 9980), (3992, 6445), (4990, 5156)]