21490777

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{3931}}^1$

素因数の和:4020

約数の個数: 16

約数和(自身を含む): 27177984

約数和(自身を除く): 5687207

約数列:

[1, 7, 11, 71, 77, 497, 781, 3931, 5467, 27517, 43241, 279101, 302687, 1953707, 3070111, 21490777]

約数ペア:

[(1, 21490777), (7, 3070111), (11, 1953707), (71, 302687), (77, 279101), (497, 43241), (781, 27517), (3931, 5467)]