Alright, let's work through 20104686 times 62937242 step by step
20104686 × 62937242 = 62937242 × (20104686)
+ 62937242 × 6 that is equal 377623452
+ 62937242 × 80 giving us 5034979360
+ 62937242 × 600 that results in 37762345200
+ 62937242 × 4000 what gives us 251748968000
+ 62937242 × 00000 yielding 0
+ 62937242 × 100000 producing 6293724200000
+ 62937242 × 0000000 what gives us 0
+ 62937242 × 20000000 resulting in 1258744840000000

= 1265333488116012
