Alright, let's work through 19542989 times 19865148 step by step
19542989 × 19865148 = 19865148 × (19542989)
+ 19865148 × 9 which equals 178786332
+ 19865148 × 80 yielding 1589211840
+ 19865148 × 900 yielding 17878633200
+ 19865148 × 2000 resulting in 39730296000
+ 19865148 × 40000 that results in 794605920000
+ 19865148 × 500000 giving us 9932574000000
+ 19865148 × 9000000 yielding 178786332000000
+ 19865148 × 10000000 giving us 198651480000000

= 388224368847372
