21907855

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 29399040

約数和(自身を除く): 7491185

約数列:

[1, 5, 19, 31, 43, 95, 155, 173, 215, 589, 817, 865, 1333, 2945, 3287, 4085, 5363, 6665, 7439, 16435, 25327, 26815, 37195, 101897, 126635, 141341, 230609, 509485, 706705, 1153045, 4381571, 21907855]

約数ペア:

[(1, 21907855), (5, 4381571), (19, 1153045), (31, 706705), (43, 509485), (95, 230609), (155, 141341), (173, 126635), (215, 101897), (589, 37195), (817, 26815), (865, 25327), (1333, 16435), (2945, 7439), (3287, 6665), (4085, 5363)]