No problem, we've got 8400 and 2436 to multiply
8400 × 2436 = 2436 × (8400)
+ 2436 × 0 that results in 0
+ 2436 × 00 what gives us 0
+ 2436 × 400 yielding 974400
+ 2436 × 8000 producing 19488000

= 20462400
