81715280

素因数分解:

$2^4\times 5^1\times {\mathrm{1021441}}^1$

素因数の和:1021454

約数の個数: 20

約数和(自身を含む): 189988212

約数和(自身を除く): 108272932

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1021441, 2042882, 4085764, 5107205, 8171528, 10214410, 16343056, 20428820, 40857640, 81715280]

約数ペア:

[(1, 81715280), (2, 40857640), (4, 20428820), (5, 16343056), (8, 10214410), (10, 8171528), (16, 5107205), (20, 4085764), (40, 2042882), (80, 1021441)]