20996780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{3191}}^1$

素因数の和:3254

約数の個数: 48

約数和(自身を含む): 51480576

約数和(自身を除く): 30483796

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 70, 94, 140, 188, 235, 329, 470, 658, 940, 1316, 1645, 3191, 3290, 6382, 6580, 12764, 15955, 22337, 31910, 44674, 63820, 89348, 111685, 149977, 223370, 299954, 446740, 599908, 749885, 1049839, 1499770, 2099678, 2999540, 4199356, 5249195, 10498390, 20996780]

約数ペア:

[(1, 20996780), (2, 10498390), (4, 5249195), (5, 4199356), (7, 2999540), (10, 2099678), (14, 1499770), (20, 1049839), (28, 749885), (35, 599908), (47, 446740), (70, 299954), (94, 223370), (140, 149977), (188, 111685), (235, 89348), (329, 63820), (470, 44674), (658, 31910), (940, 22337), (1316, 15955), (1645, 12764), (3191, 6580), (3290, 6382)]