20891787

素因数分解:

$3^1\times 7^3\times {\mathrm{79}}^1\times {\mathrm{257}}^1$

素因数の和:360

約数の個数: 32

約数和(自身を含む): 33024000

約数和(自身を除く): 12132213

約数列:

[1, 3, 7, 21, 49, 79, 147, 237, 257, 343, 553, 771, 1029, 1659, 1799, 3871, 5397, 11613, 12593, 20303, 27097, 37779, 60909, 81291, 88151, 142121, 264453, 426363, 994847, 2984541, 6963929, 20891787]

約数ペア:

[(1, 20891787), (3, 6963929), (7, 2984541), (21, 994847), (49, 426363), (79, 264453), (147, 142121), (237, 88151), (257, 81291), (343, 60909), (553, 37779), (771, 27097), (1029, 20303), (1659, 12593), (1799, 11613), (3871, 5397)]