20127779

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{331}}^1$

素因数の和:435

約数の個数: 24

約数和(自身を含む): 25206768

約数和(自身を除く): 5078989

約数列:

[1, 7, 17, 49, 73, 119, 331, 511, 833, 1241, 2317, 3577, 5627, 8687, 16219, 24163, 39389, 60809, 169141, 275723, 410771, 1183987, 2875397, 20127779]

約数ペア:

[(1, 20127779), (7, 2875397), (17, 1183987), (49, 410771), (73, 275723), (119, 169141), (331, 60809), (511, 39389), (833, 24163), (1241, 16219), (2317, 8687), (3577, 5627)]