21898513

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{107}}^1\times {\mathrm{173}}^1$

素因数の和:313

約数の個数: 24

約数和(自身を含む): 27511488

約数和(自身を除く): 5612975

約数列:

[1, 7, 13, 91, 107, 169, 173, 749, 1183, 1211, 1391, 2249, 9737, 15743, 18083, 18511, 29237, 126581, 129577, 204659, 240643, 1684501, 3128359, 21898513]

約数ペア:

[(1, 21898513), (7, 3128359), (13, 1684501), (91, 240643), (107, 204659), (169, 129577), (173, 126581), (749, 29237), (1183, 18511), (1211, 18083), (1391, 15743), (2249, 9737)]