Alright, let's work through 2379 times 8686 step by step
2379 × 8686 = 8686 × (2379)
+ 8686 × 9 giving us 78174
+ 8686 × 70 giving us 608020
+ 8686 × 300 that is equal 2605800
+ 8686 × 2000 producing 17372000

= 20663994
