No problem, we've got 4061 and 5155 to multiply
4061 × 5155 = 5155 × (4061)
+ 5155 × 1 which equals 5155
+ 5155 × 60 that equals 309300
+ 5155 × 000 that equals 0
+ 5155 × 4000 what gives us 20620000

= 20934455
