Alright, let's work through 5803 times 3553 step by step
5803 × 3553 = 3553 × (5803)
+ 3553 × 3 that equals 10659
+ 3553 × 00 producing 0
+ 3553 × 800 that equals 2842400
+ 3553 × 5000 producing 17765000

= 20618059
