Alright, let's work through 20239994 times 87315561 step by step
20239994 × 87315561 = 87315561 × (20239994)
+ 87315561 × 4 producing 349262244
+ 87315561 × 90 that equals 7858400490
+ 87315561 × 900 that equals 78584004900
+ 87315561 × 9000 that equals 785840049000
+ 87315561 × 30000 that is equal 2619466830000
+ 87315561 × 200000 resulting in 17463112200000
+ 87315561 × 0000000 which equals 0
+ 87315561 × 20000000 that is equal 1746311220000000

= 1767266430746634
