No problem, we've got 6439 and 3146 to multiply
6439 × 3146 = 3146 × (6439)
+ 3146 × 9 resulting in 28314
+ 3146 × 30 giving us 94380
+ 3146 × 400 that is equal 1258400
+ 3146 × 6000 producing 18876000

= 20257094
