81017680

素因数分解:

$2^4\times 5^1\times {\mathrm{1012721}}^1$

素因数の和:1012734

約数の個数: 20

約数和(自身を含む): 188366292

約数和(自身を除く): 107348612

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1012721, 2025442, 4050884, 5063605, 8101768, 10127210, 16203536, 20254420, 40508840, 81017680]

約数ペア:

[(1, 81017680), (2, 40508840), (4, 20254420), (5, 16203536), (8, 10127210), (10, 8101768), (16, 5063605), (20, 4050884), (40, 2025442), (80, 1012721)]