Solution - Simplification or other simple results

Step  1  :

 1.1     42 = 2•3•7

(42)² = (2•3•7)² = 2² • 3² • 7²

Equation at the end of step  1  :

  (162) +  (22•32•72)

Step  2  :

 2.1     16 = 24

(16)² = (2⁴)² = 2⁸

Equation at the end of step  2  :

  28 +  (22•32•72)

Step  3  :

Final result :

  2020