20620640

素因数分解:

$2^5\times 5^1\times {\mathrm{128879}}^1$

素因数の和:128894

約数の個数: 24

約数和(自身を含む): 48716640

約数和(自身を除く): 28096000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 128879, 257758, 515516, 644395, 1031032, 1288790, 2062064, 2577580, 4124128, 5155160, 10310320, 20620640]

約数ペア:

[(1, 20620640), (2, 10310320), (4, 5155160), (5, 4124128), (8, 2577580), (10, 2062064), (16, 1288790), (20, 1031032), (32, 644395), (40, 515516), (80, 257758), (160, 128879)]