20459020

素因数分解:

$2^2\times 5^1\times {\mathrm{401}}^1\times {\mathrm{2551}}^1$

素因数の和:2961

約数の個数: 24

約数和(自身を含む): 43087968

約数和(自身を除く): 22628948

約数列:

[1, 2, 4, 5, 10, 20, 401, 802, 1604, 2005, 2551, 4010, 5102, 8020, 10204, 12755, 25510, 51020, 1022951, 2045902, 4091804, 5114755, 10229510, 20459020]

約数ペア:

[(1, 20459020), (2, 10229510), (4, 5114755), (5, 4091804), (10, 2045902), (20, 1022951), (401, 51020), (802, 25510), (1604, 12755), (2005, 10204), (2551, 8020), (4010, 5102)]