Alright, let's work through 4005 times 5049 step by step
4005 × 5049 = 5049 × (4005)
+ 5049 × 5 yielding 25245
+ 5049 × 00 which equals 0
+ 5049 × 000 yielding 0
+ 5049 × 4000 that is equal 20196000

= 20221245
