Alright, let's work through 20737820 times 16721738 step by step
20737820 × 16721738 = 16721738 × (20737820)
+ 16721738 × 0 what gives us 0
+ 16721738 × 20 producing 334434760
+ 16721738 × 800 yielding 13377390400
+ 16721738 × 7000 yielding 117052166000
+ 16721738 × 30000 which equals 501652140000
+ 16721738 × 700000 resulting in 11705216600000
+ 16721738 × 0000000 what gives us 0
+ 16721738 × 20000000 that results in 334434760000000

= 346772392731160
