21510657

素因数分解:

$3^3\times 7^2\times {\mathrm{71}}^1\times {\mathrm{229}}^1$

素因数の和:323

約数の個数: 48

約数和(自身を含む): 37756800

約数和(自身を除く): 16246143

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 71, 147, 189, 213, 229, 441, 497, 639, 687, 1323, 1491, 1603, 1917, 2061, 3479, 4473, 4809, 6183, 10437, 11221, 13419, 14427, 16259, 31311, 33663, 43281, 48777, 93933, 100989, 113813, 146331, 302967, 341439, 438993, 796691, 1024317, 2390073, 3072951, 7170219, 21510657]

約数ペア:

[(1, 21510657), (3, 7170219), (7, 3072951), (9, 2390073), (21, 1024317), (27, 796691), (49, 438993), (63, 341439), (71, 302967), (147, 146331), (189, 113813), (213, 100989), (229, 93933), (441, 48777), (497, 43281), (639, 33663), (687, 31311), (1323, 16259), (1491, 14427), (1603, 13419), (1917, 11221), (2061, 10437), (3479, 6183), (4473, 4809)]