20991751

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{2137}}^1$

素因数の和:2214

約数の個数: 16

約数和(自身を含む): 24629760

約数和(自身を除く): 3638009

約数列:

[1, 11, 19, 47, 209, 517, 893, 2137, 9823, 23507, 40603, 100439, 446633, 1104829, 1908341, 20991751]

約数ペア:

[(1, 20991751), (11, 1908341), (19, 1104829), (47, 446633), (209, 100439), (517, 40603), (893, 23507), (2137, 9823)]