No problem, we've got 6624 and 3156 to multiply
6624 × 3156 = 3156 × (6624)
+ 3156 × 4 that results in 12624
+ 3156 × 20 that is equal 63120
+ 3156 × 600 resulting in 1893600
+ 3156 × 6000 that is equal 18936000

= 20905344
