21491771

素因数分解:

$7^1\times {\mathrm{71}}^1\times {\mathrm{83}}^1\times {\mathrm{521}}^1$

素因数の和:682

約数の個数: 16

約数和(自身を含む): 25256448

約数和(自身を除く): 3764677

約数列:

[1, 7, 71, 83, 497, 521, 581, 3647, 5893, 36991, 41251, 43243, 258937, 302701, 3070253, 21491771]

約数ペア:

[(1, 21491771), (7, 3070253), (71, 302701), (83, 258937), (497, 43243), (521, 41251), (581, 36991), (3647, 5893)]