Alright, let's work through 90347079 times 20816753 step by step
90347079 × 20816753 = 20816753 × (90347079)
+ 20816753 × 9 that results in 187350777
+ 20816753 × 70 that results in 1457172710
+ 20816753 × 000 that is equal 0
+ 20816753 × 7000 yielding 145717271000
+ 20816753 × 40000 giving us 832670120000
+ 20816753 × 300000 what gives us 6245025900000
+ 20816753 × 0000000 resulting in 0
+ 20816753 × 90000000 yielding 1873507770000000

= 1880732827814487
