Alright, let's work through 80597876 times 20672920 step by step
80597876 × 20672920 = 20672920 × (80597876)
+ 20672920 × 6 that equals 124037520
+ 20672920 × 70 resulting in 1447104400
+ 20672920 × 800 that equals 16538336000
+ 20672920 × 7000 that results in 144710440000
+ 20672920 × 90000 that equals 1860562800000
+ 20672920 × 500000 that results in 10336460000000
+ 20672920 × 0000000 giving us 0
+ 20672920 × 80000000 giving us 1653833600000000

= 1666193442717920
