Alright, let's work through 5204 times 3997 step by step
5204 × 3997 = 3997 × (5204)
+ 3997 × 4 what gives us 15988
+ 3997 × 00 producing 0
+ 3997 × 200 that results in 799400
+ 3997 × 5000 that is equal 19985000

= 20800388
