Alright, let's work through 20971804 times 89632151 step by step
20971804 × 89632151 = 89632151 × (20971804)
+ 89632151 × 4 giving us 358528604
+ 89632151 × 00 yielding 0
+ 89632151 × 800 resulting in 71705720800
+ 89632151 × 1000 what gives us 89632151000
+ 89632151 × 70000 which equals 6274250570000
+ 89632151 × 900000 that is equal 80668935900000
+ 89632151 × 0000000 producing 0
+ 89632151 × 20000000 which equals 1792643020000000

= 1879747902870404
