Alright, let's work through 4090 times 5070 step by step
4090 × 5070 = 5070 × (4090)
+ 5070 × 0 giving us 0
+ 5070 × 90 that results in 456300
+ 5070 × 000 that results in 0
+ 5070 × 4000 resulting in 20280000

= 20736300
