21890805

素因数分解:

$3^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{179}}^1\times {\mathrm{263}}^1$

素因数の和:481

約数の個数: 32

約数和(自身を含む): 36495360

約数和(自身を除く): 14604555

約数列:

[1, 3, 5, 15, 31, 93, 155, 179, 263, 465, 537, 789, 895, 1315, 2685, 3945, 5549, 8153, 16647, 24459, 27745, 40765, 47077, 83235, 122295, 141231, 235385, 706155, 1459387, 4378161, 7296935, 21890805]

約数ペア:

[(1, 21890805), (3, 7296935), (5, 4378161), (15, 1459387), (31, 706155), (93, 235385), (155, 141231), (179, 122295), (263, 83235), (465, 47077), (537, 40765), (789, 27745), (895, 24459), (1315, 16647), (2685, 8153), (3945, 5549)]