21352820

素因数分解:

$2^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{7793}}^1$

素因数の和:7939

約数の個数: 24

約数和(自身を含む): 45174024

約数和(自身を除く): 23821204

約数列:

[1, 2, 4, 5, 10, 20, 137, 274, 548, 685, 1370, 2740, 7793, 15586, 31172, 38965, 77930, 155860, 1067641, 2135282, 4270564, 5338205, 10676410, 21352820]

約数ペア:

[(1, 21352820), (2, 10676410), (4, 5338205), (5, 4270564), (10, 2135282), (20, 1067641), (137, 155860), (274, 77930), (548, 38965), (685, 31172), (1370, 15586), (2740, 7793)]