20973802087 has 4 divisors (see below), whose sum is σ = 23970059536. Its totient is φ = 17977544640.

The previous prime is 20973802079. The next prime is 20973802117. The reversal of 20973802087 is 78020837902.

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 20973802087 - 2³ = 20973802079 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 (20973802067) 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, 1498128714 + ... + 1498128727.

It is an arithmetic number, because the mean of its divisors is an integer number (5992514884).

Almost surely, 2^20973802087 is an apocalyptic number.

20973802087 is a deficient number, since it is larger than the sum of its proper divisors (2996257449).

20973802087 is an equidigital number, since it uses as much as digits as its factorization.

20973802087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2996257448.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 20973802087 in words is "twenty billion, nine hundred seventy-three million, eight hundred two thousand, eighty-seven".