Alright, let's work through 20799857 times 16782843 step by step
20799857 × 16782843 = 16782843 × (20799857)
+ 16782843 × 7 that results in 117479901
+ 16782843 × 50 that equals 839142150
+ 16782843 × 800 which equals 13426274400
+ 16782843 × 9000 giving us 151045587000
+ 16782843 × 90000 producing 1510455870000
+ 16782843 × 700000 that is equal 11747990100000
+ 16782843 × 0000000 that equals 0
+ 16782843 × 20000000 giving us 335656860000000

= 349080734453451
