No problem, we've got 4647 and 4380 to multiply
4647 × 4380 = 4380 × (4647)
+ 4380 × 7 resulting in 30660
+ 4380 × 40 what gives us 175200
+ 4380 × 600 which equals 2628000
+ 4380 × 4000 resulting in 17520000

= 20353860
