20887756552 has 64 divisors (see below), whose sum is σ = 44435160000. Its totient is φ = 9125270784.

The previous prime is 20887756517. The next prime is 20887756553. The reversal of 20887756552 is 25565778802.

It is a junction number, because it is equal to n+sod(n) for n = 20887756493 and 20887756502.

It is not an unprimeable number, because it can be changed into a prime (20887756553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2709199 + ... + 2716897.

It is an arithmetic number, because the mean of its divisors is an integer number (694299375).

Almost surely, 2^20887756552 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 20887756552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22217580000).

20887756552 is an abundant number, since it is smaller than the sum of its proper divisors (23547403448).

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

20887756552 is a wasteful number, since it uses less digits than its factorization.

20887756552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9110 (or 9106 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 55.

The spelling of 20887756552 in words is "twenty billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, five hundred fifty-two".