20013988587 has 4 divisors (see below), whose sum is σ = 26685318120. Its totient is φ = 13342659056.

The previous prime is 20013988543. The next prime is 20013988597. The reversal of 20013988587 is 78588931002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20013988587 - 2¹⁰ = 20013987563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20013988507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335664762 + ... + 3335664767.

It is an arithmetic number, because the mean of its divisors is an integer number (6671329530).

Almost surely, 2^20013988587 is an apocalyptic number.

20013988587 is a deficient number, since it is larger than the sum of its proper divisors (6671329533).

20013988587 is an equidigital number, since it uses as much as digits as its factorization.

20013988587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671329532.

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 20013988587 in words is "twenty billion, thirteen million, nine hundred eighty-eight thousand, five hundred eighty-seven".