20985419

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{173}}^1$

素因数の和:267

約数の個数: 32

約数和(自身を含む): 27439104

約数和(自身を除く): 6453685

約数列:

[1, 7, 13, 31, 43, 91, 173, 217, 301, 403, 559, 1211, 1333, 2249, 2821, 3913, 5363, 7439, 9331, 15743, 17329, 37541, 52073, 69719, 96707, 121303, 230609, 488033, 676949, 1614263, 2997917, 20985419]

約数ペア:

[(1, 20985419), (7, 2997917), (13, 1614263), (31, 676949), (43, 488033), (91, 230609), (173, 121303), (217, 96707), (301, 69719), (403, 52073), (559, 37541), (1211, 17329), (1333, 15743), (2249, 9331), (2821, 7439), (3913, 5363)]