21405293

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{3313}}^1$

素因数の和:3404

約数の個数: 16

約数和(自身を含む): 26724096

約数和(自身を除く): 5318803

約数列:

[1, 7, 13, 71, 91, 497, 923, 3313, 6461, 23191, 43069, 235223, 301483, 1646561, 3057899, 21405293]

約数ペア:

[(1, 21405293), (7, 3057899), (13, 1646561), (71, 301483), (91, 235223), (497, 43069), (923, 23191), (3313, 6461)]