20668640

素因数分解:

$2^5\times 5^1\times {\mathrm{101}}^1\times {\mathrm{1279}}^1$

素因数の和:1395

約数の個数: 48

約数和(自身を含む): 49351680

約数和(自身を除く): 28683040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 101, 160, 202, 404, 505, 808, 1010, 1279, 1616, 2020, 2558, 3232, 4040, 5116, 6395, 8080, 10232, 12790, 16160, 20464, 25580, 40928, 51160, 102320, 129179, 204640, 258358, 516716, 645895, 1033432, 1291790, 2066864, 2583580, 4133728, 5167160, 10334320, 20668640]

約数ペア:

[(1, 20668640), (2, 10334320), (4, 5167160), (5, 4133728), (8, 2583580), (10, 2066864), (16, 1291790), (20, 1033432), (32, 645895), (40, 516716), (80, 258358), (101, 204640), (160, 129179), (202, 102320), (404, 51160), (505, 40928), (808, 25580), (1010, 20464), (1279, 16160), (1616, 12790), (2020, 10232), (2558, 8080), (3232, 6395), (4040, 5116)]