21288025

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{389}}^1$

素因数の和:609

約数の個数: 24

約数和(自身を含む): 29016000

約数和(自身を除く): 7727975

約数列:

[1, 5, 11, 25, 55, 199, 275, 389, 995, 1945, 2189, 4279, 4975, 9725, 10945, 21395, 54725, 77411, 106975, 387055, 851521, 1935275, 4257605, 21288025]

約数ペア:

[(1, 21288025), (5, 4257605), (11, 1935275), (25, 851521), (55, 387055), (199, 106975), (275, 77411), (389, 54725), (995, 21395), (1945, 10945), (2189, 9725), (4279, 4975)]