Alright, let's work through 18838445 times 81982989 step by step
18838445 × 81982989 = 81982989 × (18838445)
+ 81982989 × 5 which equals 409914945
+ 81982989 × 40 yielding 3279319560
+ 81982989 × 400 that is equal 32793195600
+ 81982989 × 8000 yielding 655863912000
+ 81982989 × 30000 resulting in 2459489670000
+ 81982989 × 800000 that is equal 65586391200000
+ 81982989 × 8000000 that is equal 655863912000000
+ 81982989 × 10000000 that is equal 819829890000000

= 1544432029212105
