128808878180

素因数分解:

$2^2\times 5^1\times {\mathrm{6440443909}}^1$

素因数の和:6440443918

約数の個数: 12

約数和(自身を含む): 270498644220

約数和(自身を除く): 141689766040

約数列:

[1, 2, 4, 5, 10, 20, 6440443909, 12880887818, 25761775636, 32202219545, 64404439090, 128808878180]

約数ペア:

[(1, 128808878180), (2, 64404439090), (4, 32202219545), (5, 25761775636), (10, 12880887818), (20, 6440443909)]