No problem, we've got 20816878 and 13078397 to multiply
20816878 × 13078397 = 13078397 × (20816878)
+ 13078397 × 8 which equals 104627176
+ 13078397 × 70 that is equal 915487790
+ 13078397 × 800 yielding 10462717600
+ 13078397 × 6000 producing 78470382000
+ 13078397 × 10000 resulting in 130783970000
+ 13078397 × 800000 that equals 10462717600000
+ 13078397 × 0000000 that is equal 0
+ 13078397 × 20000000 that results in 261567940000000

= 272251394784566
