It is a self number, because there is not a number n which added to its sum of digits gives 20857715088.
It is an unprimeable number.
Almost surely, 220857715088 is an apocalyptic number.
20857715088 is a gapful number since it is divisible by the number (28) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20857715088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30889118208).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20857715088 is a wasteful number, since it uses less digits than its factorization.
20857715088 is an odious number, because the sum of its binary digits is odd.
The spelling of 20857715088 in words is "twenty billion, eight hundred fifty-seven million, seven hundred fifteen thousand, eighty-eight".