Alright, let's work through 20722943 times 71772543 step by step
20722943 × 71772543 = 71772543 × (20722943)
+ 71772543 × 3 giving us 215317629
+ 71772543 × 40 resulting in 2870901720
+ 71772543 × 900 that results in 64595288700
+ 71772543 × 2000 giving us 143545086000
+ 71772543 × 20000 what gives us 1435450860000
+ 71772543 × 700000 which equals 50240780100000
+ 71772543 × 0000000 resulting in 0
+ 71772543 × 20000000 that equals 1435450860000000

= 1487338317554049
