21090465

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{137}}^1\times {\mathrm{311}}^1$

素因数の和:470

約数の個数: 48

約数和(自身を含む): 40300416

約数和(自身を除く): 19209951

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 99, 137, 165, 311, 411, 495, 685, 933, 1233, 1507, 1555, 2055, 2799, 3421, 4521, 4665, 6165, 7535, 10263, 13563, 13995, 17105, 22605, 30789, 42607, 51315, 67815, 127821, 153945, 213035, 383463, 468677, 639105, 1406031, 1917315, 2343385, 4218093, 7030155, 21090465]

約数ペア:

[(1, 21090465), (3, 7030155), (5, 4218093), (9, 2343385), (11, 1917315), (15, 1406031), (33, 639105), (45, 468677), (55, 383463), (99, 213035), (137, 153945), (165, 127821), (311, 67815), (411, 51315), (495, 42607), (685, 30789), (933, 22605), (1233, 17105), (1507, 13995), (1555, 13563), (2055, 10263), (2799, 7535), (3421, 6165), (4521, 4665)]