Alright, let's work through 20084320 times 20504834 step by step
20084320 × 20504834 = 20504834 × (20084320)
+ 20504834 × 0 what gives us 0
+ 20504834 × 20 yielding 410096680
+ 20504834 × 300 that is equal 6151450200
+ 20504834 × 4000 that results in 82019336000
+ 20504834 × 80000 what gives us 1640386720000
+ 20504834 × 000000 what gives us 0
+ 20504834 × 0000000 yielding 0
+ 20504834 × 20000000 yielding 410096680000000

= 411825647602880
