No problem, we've got 6581 and 3173 to multiply
6581 × 3173 = 3173 × (6581)
+ 3173 × 1 resulting in 3173
+ 3173 × 80 that equals 253840
+ 3173 × 500 what gives us 1586500
+ 3173 × 6000 resulting in 19038000

= 20881513
