81660140

素因数分解:

$2^2\times 5^1\times {\mathrm{191}}^1\times {\mathrm{21377}}^1$

素因数の和:21577

約数の個数: 24

約数和(自身を含む): 172392192

約数和(自身を除く): 90732052

約数列:

[1, 2, 4, 5, 10, 20, 191, 382, 764, 955, 1910, 3820, 21377, 42754, 85508, 106885, 213770, 427540, 4083007, 8166014, 16332028, 20415035, 40830070, 81660140]

約数ペア:

[(1, 81660140), (2, 40830070), (4, 20415035), (5, 16332028), (10, 8166014), (20, 4083007), (191, 427540), (382, 213770), (764, 106885), (955, 85508), (1910, 42754), (3820, 21377)]