21405175

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{277}}^1\times {\mathrm{281}}^1$

素因数の和:579

約数の個数: 24

約数和(自身を含む): 29163312

約数和(自身を除く): 7758137

約数列:

[1, 5, 11, 25, 55, 275, 277, 281, 1385, 1405, 3047, 3091, 6925, 7025, 15235, 15455, 76175, 77275, 77837, 389185, 856207, 1945925, 4281035, 21405175]

約数ペア:

[(1, 21405175), (5, 4281035), (11, 1945925), (25, 856207), (55, 389185), (275, 77837), (277, 77275), (281, 76175), (1385, 15455), (1405, 15235), (3047, 7025), (3091, 6925)]