Alright, let's work through 4020 times 5323 step by step
4020 × 5323 = 5323 × (4020)
+ 5323 × 0 what gives us 0
+ 5323 × 20 which equals 106460
+ 5323 × 000 which equals 0
+ 5323 × 4000 that results in 21292000

= 21398460
