Alright, let's work through 5239 times 4003 step by step
5239 × 4003 = 4003 × (5239)
+ 4003 × 9 that is equal 36027
+ 4003 × 30 which equals 120090
+ 4003 × 200 giving us 800600
+ 4003 × 5000 giving us 20015000

= 20971717
