128312560

素因数分解:

$2^4\times 5^1\times {\mathrm{1603907}}^1$

素因数の和:1603920

約数の個数: 20

約数和(自身を含む): 298326888

約数和(自身を除く): 170014328

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1603907, 3207814, 6415628, 8019535, 12831256, 16039070, 25662512, 32078140, 64156280, 128312560]

約数ペア:

[(1, 128312560), (2, 64156280), (4, 32078140), (5, 25662512), (8, 16039070), (10, 12831256), (16, 8019535), (20, 6415628), (40, 3207814), (80, 1603907)]