20007729

素因数分解:

$3^4\times 7^2\times {\mathrm{71}}^2$

素因数の和:168

約数の個数: 45

約数和(自身を含む): 35264361

約数和(自身を除く): 15256632

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 71, 81, 147, 189, 213, 441, 497, 567, 639, 1323, 1491, 1917, 3479, 3969, 4473, 5041, 5751, 10437, 13419, 15123, 31311, 35287, 40257, 45369, 93933, 105861, 136107, 247009, 281799, 317583, 408321, 741027, 952749, 2223081, 2858247, 6669243, 20007729]

約数ペア:

[(1, 20007729), (3, 6669243), (7, 2858247), (9, 2223081), (21, 952749), (27, 741027), (49, 408321), (63, 317583), (71, 281799), (81, 247009), (147, 136107), (189, 105861), (213, 93933), (441, 45369), (497, 40257), (567, 35287), (639, 31311), (1323, 15123), (1491, 13419), (1917, 10437), (3479, 5751), (3969, 5041)]