Alright, let's work through 5045 times 3997 step by step
5045 × 3997 = 3997 × (5045)
+ 3997 × 5 giving us 19985
+ 3997 × 40 that equals 159880
+ 3997 × 000 which equals 0
+ 3997 × 5000 yielding 19985000

= 20164865
