20586637487 has 12 divisors (see below), whose sum is σ = 22317618600. Its totient is φ = 18981245088.

The previous prime is 20586637483. The next prime is 20586637523. The reversal of 20586637487 is 78473668502.

It is not a de Polignac number, because 20586637487 - 2² = 20586637483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20586637483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78764 + ... + 217662.

It is an arithmetic number, because the mean of its divisors is an integer number (1859801550).

Almost surely, 2^20586637487 is an apocalyptic number.

20586637487 is a deficient number, since it is larger than the sum of its proper divisors (1730981113).

20586637487 is a wasteful number, since it uses less digits than its factorization.

20586637487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139802 (or 139789 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 20586637487 in words is "twenty billion, five hundred eighty-six million, six hundred thirty-seven thousand, four hundred eighty-seven".