20971289587 has 6 divisors (see below), whose sum is σ = 21470337852. Its totient is φ = 20483583372.

The previous prime is 20971289569. The next prime is 20971289609. The reversal of 20971289587 is 78598217902.

It is not a de Polignac number, because 20971289587 - 2²³ = 20962900979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20971289527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5669133 + ... + 5672830.

It is an arithmetic number, because the mean of its divisors is an integer number (3578389642).

Almost surely, 2^20971289587 is an apocalyptic number.

20971289587 is a deficient number, since it is larger than the sum of its proper divisors (499048265).

20971289587 is an equidigital number, since it uses as much as digits as its factorization.

20971289587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11342049 (or 11342006 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 20971289587 in words is "twenty billion, nine hundred seventy-one million, two hundred eighty-nine thousand, five hundred eighty-seven".