81520820

素因数分解:

$2^2\times 5^1\times {\mathrm{709}}^1\times {\mathrm{5749}}^1$

素因数の和:6467

約数の個数: 24

約数和(自身を含む): 171465000

約数和(自身を除く): 89944180

約数列:

[1, 2, 4, 5, 10, 20, 709, 1418, 2836, 3545, 5749, 7090, 11498, 14180, 22996, 28745, 57490, 114980, 4076041, 8152082, 16304164, 20380205, 40760410, 81520820]

約数ペア:

[(1, 81520820), (2, 40760410), (4, 20380205), (5, 16304164), (10, 8152082), (20, 4076041), (709, 114980), (1418, 57490), (2836, 28745), (3545, 22996), (5749, 14180), (7090, 11498)]