Alright, let's work through 20135804 times 77341794 step by step
20135804 × 77341794 = 77341794 × (20135804)
+ 77341794 × 4 giving us 309367176
+ 77341794 × 00 giving us 0
+ 77341794 × 800 which equals 61873435200
+ 77341794 × 5000 giving us 386708970000
+ 77341794 × 30000 which equals 2320253820000
+ 77341794 × 100000 yielding 7734179400000
+ 77341794 × 0000000 that equals 0
+ 77341794 × 20000000 that equals 1546835880000000

= 1557339204992376
