Alright, let's work through 3173 times 6473 step by step
3173 × 6473 = 6473 × (3173)
+ 6473 × 3 that is equal 19419
+ 6473 × 70 producing 453110
+ 6473 × 100 resulting in 647300
+ 6473 × 3000 giving us 19419000

= 20538829
