Alright, let's work through 20981949 times 15010020 step by step
20981949 × 15010020 = 15010020 × (20981949)
+ 15010020 × 9 that results in 135090180
+ 15010020 × 40 that equals 600400800
+ 15010020 × 900 resulting in 13509018000
+ 15010020 × 1000 that results in 15010020000
+ 15010020 × 80000 yielding 1200801600000
+ 15010020 × 900000 that results in 13509018000000
+ 15010020 × 0000000 that results in 0
+ 15010020 × 20000000 which equals 300200400000000

= 314939474128980
