Alright, let's work through 20404243 times 27135199 step by step
20404243 × 27135199 = 27135199 × (20404243)
+ 27135199 × 3 giving us 81405597
+ 27135199 × 40 which equals 1085407960
+ 27135199 × 200 resulting in 5427039800
+ 27135199 × 4000 what gives us 108540796000
+ 27135199 × 00000 that is equal 0
+ 27135199 × 400000 producing 10854079600000
+ 27135199 × 0000000 that equals 0
+ 27135199 × 20000000 that results in 542703980000000

= 553673194249357
