20905775

素因数分解:

$5^2\times {\mathrm{11}}^2\times {\mathrm{6911}}^1$

素因数の和:6943

約数の個数: 18

約数和(自身を含む): 28498176

約数和(自身を除く): 7592401

約数列:

[1, 5, 11, 25, 55, 121, 275, 605, 3025, 6911, 34555, 76021, 172775, 380105, 836231, 1900525, 4181155, 20905775]

約数ペア:

[(1, 20905775), (5, 4181155), (11, 1900525), (25, 836231), (55, 380105), (121, 172775), (275, 76021), (605, 34555), (3025, 6911)]