21217480

素因数分解:

$2^3\times 5^1\times {\mathrm{499}}^1\times {\mathrm{1063}}^1$

素因数の和:1573

約数の個数: 32

約数和(自身を含む): 47880000

約数和(自身を除く): 26662520

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499, 998, 1063, 1996, 2126, 2495, 3992, 4252, 4990, 5315, 8504, 9980, 10630, 19960, 21260, 42520, 530437, 1060874, 2121748, 2652185, 4243496, 5304370, 10608740, 21217480]

約数ペア:

[(1, 21217480), (2, 10608740), (4, 5304370), (5, 4243496), (8, 2652185), (10, 2121748), (20, 1060874), (40, 530437), (499, 42520), (998, 21260), (1063, 19960), (1996, 10630), (2126, 9980), (2495, 8504), (3992, 5315), (4252, 4990)]