28212820

素因数分解:

$2^2\times 5^1\times {\mathrm{409}}^1\times {\mathrm{3449}}^1$

素因数の和:3867

約数の個数: 24

約数和(自身を含む): 59409000

約数和(自身を除く): 31196180

約数列:

[1, 2, 4, 5, 10, 20, 409, 818, 1636, 2045, 3449, 4090, 6898, 8180, 13796, 17245, 34490, 68980, 1410641, 2821282, 5642564, 7053205, 14106410, 28212820]

約数ペア:

[(1, 28212820), (2, 14106410), (4, 7053205), (5, 5642564), (10, 2821282), (20, 1410641), (409, 68980), (818, 34490), (1636, 17245), (2045, 13796), (3449, 8180), (4090, 6898)]