20885000000 has 112 divisors (see below), whose sum is σ = 51816859536. Its totient is φ = 8352000000.

The previous prime is 20884999997. The next prime is 20885000033. The reversal of 20885000000 is 58802.

It can be written as a sum of positive squares in 8 ways, for example, as 19669501504 + 1215498496 = 140248^2 + 34864^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20885000000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4997912 + ... + 5002088.

Almost surely, 2^20885000000 is an apocalyptic number.

20885000000 is a gapful number since it is divisible by the number (20) 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 20885000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25908429768).

20885000000 is an abundant number, since it is smaller than the sum of its proper divisors (30931859536).

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

20885000000 is an frugal number, since it uses more digits than its factorization.

20885000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224 (or 4184 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 20885000000 its reverse (58802), we get a palindrome (20885058802).

The spelling of 20885000000 in words is "twenty billion, eight hundred eighty-five million", and thus it is an aban number.