No problem, we've got 6447 and 3199 to multiply
6447 × 3199 = 3199 × (6447)
+ 3199 × 7 resulting in 22393
+ 3199 × 40 that is equal 127960
+ 3199 × 400 that is equal 1279600
+ 3199 × 6000 yielding 19194000

= 20623953
