It is a self number, because there is not a number n which added to its sum of digits gives 20787757478034.
It is an unprimeable number.
Almost surely, 220787757478034 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20787757478034 is a wasteful number, since it uses less digits than its factorization.
20787757478034 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 84503079225.
The spelling of 20787757478034 in words is "twenty trillion, seven hundred eighty-seven billion, seven hundred fifty-seven million, four hundred seventy-eight thousand, thirty-four".