20538640

素因数分解:

$2^4\times 5^1\times {\mathrm{139}}^1\times {\mathrm{1847}}^1$

素因数の和:1999

約数の個数: 40

約数和(自身を含む): 48121920

約数和(自身を除く): 27583280

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 139, 278, 556, 695, 1112, 1390, 1847, 2224, 2780, 3694, 5560, 7388, 9235, 11120, 14776, 18470, 29552, 36940, 73880, 147760, 256733, 513466, 1026932, 1283665, 2053864, 2567330, 4107728, 5134660, 10269320, 20538640]

約数ペア:

[(1, 20538640), (2, 10269320), (4, 5134660), (5, 4107728), (8, 2567330), (10, 2053864), (16, 1283665), (20, 1026932), (40, 513466), (80, 256733), (139, 147760), (278, 73880), (556, 36940), (695, 29552), (1112, 18470), (1390, 14776), (1847, 11120), (2224, 9235), (2780, 7388), (3694, 5560)]