81538640

素因数分解:

$2^4\times 5^1\times {\mathrm{193}}^1\times {\mathrm{5281}}^1$

素因数の和:5487

約数の個数: 40

約数和(自身を含む): 190595688

約数和(自身を除く): 109057048

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 193, 386, 772, 965, 1544, 1930, 3088, 3860, 5281, 7720, 10562, 15440, 21124, 26405, 42248, 52810, 84496, 105620, 211240, 422480, 1019233, 2038466, 4076932, 5096165, 8153864, 10192330, 16307728, 20384660, 40769320, 81538640]

約数ペア:

[(1, 81538640), (2, 40769320), (4, 20384660), (5, 16307728), (8, 10192330), (10, 8153864), (16, 5096165), (20, 4076932), (40, 2038466), (80, 1019233), (193, 422480), (386, 211240), (772, 105620), (965, 84496), (1544, 52810), (1930, 42248), (3088, 26405), (3860, 21124), (5281, 15440), (7720, 10562)]