20212780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{353}}^1\times {\mathrm{409}}^1$

素因数の和:778

約数の個数: 48

約数和(自身を含む): 48767040

約数和(自身を除く): 28554260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 353, 409, 706, 818, 1412, 1636, 1765, 2045, 2471, 2863, 3530, 4090, 4942, 5726, 7060, 8180, 9884, 11452, 12355, 14315, 24710, 28630, 49420, 57260, 144377, 288754, 577508, 721885, 1010639, 1443770, 2021278, 2887540, 4042556, 5053195, 10106390, 20212780]

約数ペア:

[(1, 20212780), (2, 10106390), (4, 5053195), (5, 4042556), (7, 2887540), (10, 2021278), (14, 1443770), (20, 1010639), (28, 721885), (35, 577508), (70, 288754), (140, 144377), (353, 57260), (409, 49420), (706, 28630), (818, 24710), (1412, 14315), (1636, 12355), (1765, 11452), (2045, 9884), (2471, 8180), (2863, 7060), (3530, 5726), (4090, 4942)]