20551886688 has 48 divisors (see below), whose sum is σ = 53956324800. Its totient is φ = 6849661056.

The previous prime is 20551886651. The next prime is 20551886783. The reversal of 20551886688 is 88668815502.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075231 + ... + 1094177.

It is an arithmetic number, because the mean of its divisors is an integer number (1124090100).

Almost surely, 2^20551886688 is an apocalyptic number.

It is an amenable number.

20551886688 is an abundant number, since it is smaller than the sum of its proper divisors (33404438112).

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

20551886688 is a wasteful number, since it uses less digits than its factorization.

20551886688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30259 (or 30251 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 57.

The spelling of 20551886688 in words is "twenty billion, five hundred fifty-one million, eight hundred eighty-six thousand, six hundred eighty-eight".