20672780

素因数分解:

$2^2\times 5^1\times {\mathrm{821}}^1\times {\mathrm{1259}}^1$

素因数の和:2089

約数の個数: 24

約数和(自身を含む): 43500240

約数和(自身を除く): 22827460

約数列:

[1, 2, 4, 5, 10, 20, 821, 1259, 1642, 2518, 3284, 4105, 5036, 6295, 8210, 12590, 16420, 25180, 1033639, 2067278, 4134556, 5168195, 10336390, 20672780]

約数ペア:

[(1, 20672780), (2, 10336390), (4, 5168195), (5, 4134556), (10, 2067278), (20, 1033639), (821, 25180), (1259, 16420), (1642, 12590), (2518, 8210), (3284, 6295), (4105, 5036)]