820720

素因数分解:

$2^4\times 5^1\times {\mathrm{10259}}^1$

素因数の和:10272

約数の個数: 20

約数和(自身を含む): 1908360

約数和(自身を除く): 1087640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 10259, 20518, 41036, 51295, 82072, 102590, 164144, 205180, 410360, 820720]

約数ペア:

[(1, 820720), (2, 410360), (4, 205180), (5, 164144), (8, 102590), (10, 82072), (16, 51295), (20, 41036), (40, 20518), (80, 10259)]