Alright, let's work through 1806 times 9920 step by step
1806 × 9920 = 9920 × (1806)
+ 9920 × 6 that results in 59520
+ 9920 × 00 yielding 0
+ 9920 × 800 what gives us 7936000
+ 9920 × 1000 giving us 9920000

= 17915520
