21250640

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2437}}^1$

素因数の和:2559

約数の個数: 40

約数和(自身を含む): 49881480

約数和(自身を除く): 28630840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2437, 4360, 4874, 8720, 9748, 12185, 19496, 24370, 38992, 48740, 97480, 194960, 265633, 531266, 1062532, 1328165, 2125064, 2656330, 4250128, 5312660, 10625320, 21250640]

約数ペア:

[(1, 21250640), (2, 10625320), (4, 5312660), (5, 4250128), (8, 2656330), (10, 2125064), (16, 1328165), (20, 1062532), (40, 531266), (80, 265633), (109, 194960), (218, 97480), (436, 48740), (545, 38992), (872, 24370), (1090, 19496), (1744, 12185), (2180, 9748), (2437, 8720), (4360, 4874)]