Alright, let's work through 20789003 times 6801803 step by step
20789003 × 6801803 = 6801803 × (20789003)
+ 6801803 × 3 producing 20405409
+ 6801803 × 00 that is equal 0
+ 6801803 × 000 resulting in 0
+ 6801803 × 9000 what gives us 61216227000
+ 6801803 × 80000 that is equal 544144240000
+ 6801803 × 700000 giving us 4761262100000
+ 6801803 × 0000000 that is equal 0
+ 6801803 × 20000000 producing 136036060000000

= 141402702972409
