20787822768 has 160 divisors (see below), whose sum is σ = 59408197632. Its totient is φ = 6234624000.

The previous prime is 20787822701. The next prime is 20787822773. The reversal of 20787822768 is 86722878702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2094618 + ... + 2104518.

Almost surely, 2^20787822768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20787822768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29704098816).

20787822768 is an abundant number, since it is smaller than the sum of its proper divisors (38620374864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20787822768 is a wasteful number, since it uses less digits than its factorization.

20787822768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043 (or 10037 counting only the distinct ones).

The product of its (nonzero) digits is 8429568, while the sum is 57.

The spelling of 20787822768 in words is "twenty billion, seven hundred eighty-seven million, eight hundred twenty-two thousand, seven hundred sixty-eight".