Alright, let's work through 20341784 times 12380457 step by step
20341784 × 12380457 = 12380457 × (20341784)
+ 12380457 × 4 giving us 49521828
+ 12380457 × 80 which equals 990436560
+ 12380457 × 700 resulting in 8666319900
+ 12380457 × 1000 giving us 12380457000
+ 12380457 × 40000 giving us 495218280000
+ 12380457 × 300000 that equals 3714137100000
+ 12380457 × 0000000 what gives us 0
+ 12380457 × 20000000 that is equal 247609140000000

= 251840582115288
