21805713

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{47507}}^1$

素因数の和:47533

約数の個数: 16

約数和(自身を含む): 34205760

約数和(自身を除く): 12400047

約数列:

[1, 3, 9, 17, 27, 51, 153, 459, 47507, 142521, 427563, 807619, 1282689, 2422857, 7268571, 21805713]

約数ペア:

[(1, 21805713), (3, 7268571), (9, 2422857), (17, 1282689), (27, 807619), (51, 427563), (153, 142521), (459, 47507)]