21012560

素因数分解:

$2^4\times 5^1\times {\mathrm{262657}}^1$

素因数の和:262670

約数の個数: 20

約数和(自身を含む): 48854388

約数和(自身を除く): 27841828

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262657, 525314, 1050628, 1313285, 2101256, 2626570, 4202512, 5253140, 10506280, 21012560]

約数ペア:

[(1, 21012560), (2, 10506280), (4, 5253140), (5, 4202512), (8, 2626570), (10, 2101256), (16, 1313285), (20, 1050628), (40, 525314), (80, 262657)]