20506717

素因数分解:

$7^1\times {\mathrm{11}}^3\times {\mathrm{31}}^1\times {\mathrm{71}}^1$

素因数の和:142

約数の個数: 32

約数和(自身を含む): 26984448

約数和(自身を除く): 6477731

約数列:

[1, 7, 11, 31, 71, 77, 121, 217, 341, 497, 781, 847, 1331, 2201, 2387, 3751, 5467, 8591, 9317, 15407, 24211, 26257, 41261, 60137, 94501, 169477, 266321, 288827, 661507, 1864247, 2929531, 20506717]

約数ペア:

[(1, 20506717), (7, 2929531), (11, 1864247), (31, 661507), (71, 288827), (77, 266321), (121, 169477), (217, 94501), (341, 60137), (497, 41261), (781, 26257), (847, 24211), (1331, 15407), (2201, 9317), (2387, 8591), (3751, 5467)]