Alright, let's work through 19986772 times 64395014 step by step
19986772 × 64395014 = 64395014 × (19986772)
+ 64395014 × 2 what gives us 128790028
+ 64395014 × 70 that results in 4507650980
+ 64395014 × 700 producing 45076509800
+ 64395014 × 6000 which equals 386370084000
+ 64395014 × 80000 which equals 5151601120000
+ 64395014 × 900000 resulting in 57955512600000
+ 64395014 × 9000000 resulting in 579555126000000
+ 64395014 × 10000000 resulting in 643950140000000

= 1287048462754808
