20991393

素因数分解:

$3^4\times {\mathrm{337}}^1\times {\mathrm{769}}^1$

素因数の和:1118

約数の個数: 20

約数和(自身を含む): 31491460

約数和(自身を除く): 10500067

約数列:

[1, 3, 9, 27, 81, 337, 769, 1011, 2307, 3033, 6921, 9099, 20763, 27297, 62289, 259153, 777459, 2332377, 6997131, 20991393]

約数ペア:

[(1, 20991393), (3, 6997131), (9, 2332377), (27, 777459), (81, 259153), (337, 62289), (769, 27297), (1011, 20763), (2307, 9099), (3033, 6921)]