21311619

素因数分解:

$3^1\times 7^3\times {\mathrm{139}}^1\times {\mathrm{149}}^1$

素因数の和:312

約数の個数: 32

約数和(自身を含む): 33600000

約数和(自身を除く): 12288381

約数列:

[1, 3, 7, 21, 49, 139, 147, 149, 343, 417, 447, 973, 1029, 1043, 2919, 3129, 6811, 7301, 20433, 20711, 21903, 47677, 51107, 62133, 143031, 144977, 153321, 434931, 1014839, 3044517, 7103873, 21311619]

約数ペア:

[(1, 21311619), (3, 7103873), (7, 3044517), (21, 1014839), (49, 434931), (139, 153321), (147, 144977), (149, 143031), (343, 62133), (417, 51107), (447, 47677), (973, 21903), (1029, 20711), (1043, 20433), (2919, 7301), (3129, 6811)]