Alright, let's work through 5405 times 4056 step by step
5405 × 4056 = 4056 × (5405)
+ 4056 × 5 that equals 20280
+ 4056 × 00 that results in 0
+ 4056 × 400 giving us 1622400
+ 4056 × 5000 giving us 20280000

= 21922680
