Alright, let's work through 6539 times 1020 step by step
6539 × 1020 = 1020 × (6539)
+ 1020 × 9 giving us 9180
+ 1020 × 30 that is equal 30600
+ 1020 × 500 that equals 510000
+ 1020 × 6000 giving us 6120000

= 6669780
