Alright, let's work through 20071123 times 27199799 step by step
20071123 × 27199799 = 27199799 × (20071123)
+ 27199799 × 3 what gives us 81599397
+ 27199799 × 20 that results in 543995980
+ 27199799 × 100 that results in 2719979900
+ 27199799 × 1000 that results in 27199799000
+ 27199799 × 70000 that equals 1903985930000
+ 27199799 × 000000 producing 0
+ 27199799 × 0000000 producing 0
+ 27199799 × 20000000 which equals 543995980000000

= 545930511304277
