20781508

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{42937}}^1$

素因数の和:42963

約数の個数: 18

約数和(自身を含む): 39975278

約数和(自身を除く): 19193770

約数列:

[1, 2, 4, 11, 22, 44, 121, 242, 484, 42937, 85874, 171748, 472307, 944614, 1889228, 5195377, 10390754, 20781508]

約数ペア:

[(1, 20781508), (2, 10390754), (4, 5195377), (11, 1889228), (22, 944614), (44, 472307), (121, 171748), (242, 85874), (484, 42937)]