Alright, let's work through 20740821 times 77174460 step by step
20740821 × 77174460 = 77174460 × (20740821)
+ 77174460 × 1 that results in 77174460
+ 77174460 × 20 that results in 1543489200
+ 77174460 × 800 producing 61739568000
+ 77174460 × 0000 that equals 0
+ 77174460 × 40000 that equals 3086978400000
+ 77174460 × 700000 yielding 54022122000000
+ 77174460 × 0000000 what gives us 0
+ 77174460 × 20000000 which equals 1543489200000000

= 1600661660631660
