Alright, let's work through 3645 times 5630 step by step
3645 × 5630 = 5630 × (3645)
+ 5630 × 5 producing 28150
+ 5630 × 40 that results in 225200
+ 5630 × 600 that equals 3378000
+ 5630 × 3000 producing 16890000

= 20521350
