No problem, we've got 8157 and 2564 to multiply
8157 × 2564 = 2564 × (8157)
+ 2564 × 7 giving us 17948
+ 2564 × 50 giving us 128200
+ 2564 × 100 yielding 256400
+ 2564 × 8000 which equals 20512000

= 20914548
