20799740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{79999}}^1$

素因数の和:80021

約数の個数: 24

約数和(自身を含む): 47040000

約数和(自身を除く): 26240260

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 79999, 159998, 319996, 399995, 799990, 1039987, 1599980, 2079974, 4159948, 5199935, 10399870, 20799740]

約数ペア:

[(1, 20799740), (2, 10399870), (4, 5199935), (5, 4159948), (10, 2079974), (13, 1599980), (20, 1039987), (26, 799990), (52, 399995), (65, 319996), (130, 159998), (260, 79999)]