Alright, let's work through 20759091 times 64011977 step by step
20759091 × 64011977 = 64011977 × (20759091)
+ 64011977 × 1 what gives us 64011977
+ 64011977 × 90 producing 5761077930
+ 64011977 × 000 producing 0
+ 64011977 × 9000 that is equal 576107793000
+ 64011977 × 50000 producing 3200598850000
+ 64011977 × 700000 yielding 44808383900000
+ 64011977 × 0000000 producing 0
+ 64011977 × 20000000 giving us 1280239540000000

= 1328830455632907
