No problem, we've got 2640 and 7793 to multiply
2640 × 7793 = 7793 × (2640)
+ 7793 × 0 that is equal 0
+ 7793 × 40 giving us 311720
+ 7793 × 600 which equals 4675800
+ 7793 × 2000 giving us 15586000

= 20573520
