If \overrightarrow{a} \times \overrightarrow{b}=7 \hat{𝑖}+9 \hat{𝑗}+10 \hat{k} and \overrightarrow{a} \cdot \overrightarrow{b}=-20, then |\overrightarrow{a}|^2|\overrightarrow{b}|^2=