21208055

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{5431}}^1$

素因数の和:5518

約数の個数: 16

約数和(自身を含む): 28159488

約数和(自身を除く): 6951433

約数列:

[1, 5, 11, 55, 71, 355, 781, 3905, 5431, 27155, 59741, 298705, 385601, 1928005, 4241611, 21208055]

約数ペア:

[(1, 21208055), (5, 4241611), (11, 1928005), (55, 385601), (71, 298705), (355, 59741), (781, 27155), (3905, 5431)]