19916281

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{3643}}^1$

素因数の和:3732

約数の個数: 16

約数和(自身を含む): 25187328

約数和(自身を除く): 5271047

約数列:

[1, 7, 11, 71, 77, 497, 781, 3643, 5467, 25501, 40073, 258653, 280511, 1810571, 2845183, 19916281]

約数ペア:

[(1, 19916281), (7, 2845183), (11, 1810571), (71, 280511), (77, 258653), (497, 40073), (781, 25501), (3643, 5467)]