20516988 has 12 divisors (see below), whose sum is σ = 47873000. Its totient is φ = 6838992.

The previous prime is 20516953. The next prime is 20516999. The reversal of 20516988 is 88961502.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854863 + ... + 854886.

Almost surely, 2^20516988 is an apocalyptic number.

It is an amenable number.

20516988 is an abundant number, since it is smaller than the sum of its proper divisors (27356012).

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

20516988 is a wasteful number, since it uses less digits than its factorization.

20516988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709756 (or 1709754 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 20516988 is about 4529.5681913401. The cubic root of 20516988 is about 273.7607622799.

The spelling of 20516988 in words is "twenty million, five hundred sixteen thousand, nine hundred eighty-eight".