19905431

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{5087}}^1$

素因数の和:5150

約数の個数: 16

約数和(自身を含む): 25073664

約数和(自身を除く): 5168233

約数列:

[1, 7, 13, 43, 91, 301, 559, 3913, 5087, 35609, 66131, 218741, 462917, 1531187, 2843633, 19905431]

約数ペア:

[(1, 19905431), (7, 2843633), (13, 1531187), (43, 462917), (91, 218741), (301, 66131), (559, 35609), (3913, 5087)]