Alright, let's work through 2539 times 8220 step by step
2539 × 8220 = 8220 × (2539)
+ 8220 × 9 producing 73980
+ 8220 × 30 that results in 246600
+ 8220 × 500 producing 4110000
+ 8220 × 2000 that is equal 16440000

= 20870580
