81200720

素因数分解:

$2^4\times 5^1\times {\mathrm{1015009}}^1$

素因数の和:1015022

約数の個数: 20

約数和(自身を含む): 188791860

約数和(自身を除く): 107591140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1015009, 2030018, 4060036, 5075045, 8120072, 10150090, 16240144, 20300180, 40600360, 81200720]

約数ペア:

[(1, 81200720), (2, 40600360), (4, 20300180), (5, 16240144), (8, 10150090), (10, 8120072), (16, 5075045), (20, 4060036), (40, 2030018), (80, 1015009)]