For the reaction A $\to$ B, the rate constant k(in s^$-$1) is given by

${\log _{10}}k = 20.35 - {{(2.47 \times {{10}^3})} \over T}$

The energy of activation in kJ mol^$-$1 is ____________. (Nearest integer) [Given : R = 8.314 J K^$-$1 mol^$-$1]