19720720

素因数分解:

$2^4\times 5^1\times {\mathrm{246509}}^1$

素因数の和:246522

約数の個数: 20

約数和(自身を含む): 45850860

約数和(自身を除く): 26130140

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 246509, 493018, 986036, 1232545, 1972072, 2465090, 3944144, 4930180, 9860360, 19720720]

約数ペア:

[(1, 19720720), (2, 9860360), (4, 4930180), (5, 3944144), (8, 2465090), (10, 1972072), (16, 1232545), (20, 986036), (40, 493018), (80, 246509)]