Alright, let's work through 3664 times 5579 step by step
3664 × 5579 = 5579 × (3664)
+ 5579 × 4 that is equal 22316
+ 5579 × 60 that equals 334740
+ 5579 × 600 what gives us 3347400
+ 5579 × 3000 what gives us 16737000

= 20441456
