21819791

素因数分解:

$7^1\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{1021}}^1$

素因数の和:1142

約数の個数: 16

約数和(自身を含む): 25901568

約数和(自身を除く): 4081777

約数列:

[1, 7, 43, 71, 301, 497, 1021, 3053, 7147, 21371, 43903, 72491, 307321, 507437, 3117113, 21819791]

約数ペア:

[(1, 21819791), (7, 3117113), (43, 507437), (71, 307321), (301, 72491), (497, 43903), (1021, 21371), (3053, 7147)]