No problem, we've got 6420 and 3946 to multiply
6420 × 3946 = 3946 × (6420)
+ 3946 × 0 resulting in 0
+ 3946 × 20 what gives us 78920
+ 3946 × 400 yielding 1578400
+ 3946 × 6000 that equals 23676000

= 25333320
