Alright, let's work through 20883608 times 77688178 step by step
20883608 × 77688178 = 77688178 × (20883608)
+ 77688178 × 8 that results in 621505424
+ 77688178 × 00 what gives us 0
+ 77688178 × 600 that equals 46612906800
+ 77688178 × 3000 what gives us 233064534000
+ 77688178 × 80000 that results in 6215054240000
+ 77688178 × 800000 that equals 62150542400000
+ 77688178 × 0000000 what gives us 0
+ 77688178 × 20000000 producing 1553763560000000

= 1622409455586224
