21990227

素因数分解:

$7^1\times {\mathrm{41}}^1\times {\mathrm{193}}^1\times {\mathrm{397}}^1$

素因数の和:638

約数の個数: 16

約数和(自身を含む): 25943232

約数和(自身を除く): 3953005

約数列:

[1, 7, 41, 193, 287, 397, 1351, 2779, 7913, 16277, 55391, 76621, 113939, 536347, 3141461, 21990227]

約数ペア:

[(1, 21990227), (7, 3141461), (41, 536347), (193, 113939), (287, 76621), (397, 55391), (1351, 16277), (2779, 7913)]