Alright, let's work through 3640 times 5473 step by step
3640 × 5473 = 5473 × (3640)
+ 5473 × 0 that is equal 0
+ 5473 × 40 resulting in 218920
+ 5473 × 600 that results in 3283800
+ 5473 × 3000 producing 16419000

= 19921720
