20923588979 has 4 divisors (see below), whose sum is σ = 20924321976. Its totient is φ = 20922855984.

The previous prime is 20923588909. The next prime is 20923588993. The reversal of 20923588979 is 97988532902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20923588979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20923588909) 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, 321869 + ... + 381374.

It is an arithmetic number, because the mean of its divisors is an integer number (5231080494).

Almost surely, 2^20923588979 is an apocalyptic number.

20923588979 is a deficient number, since it is larger than the sum of its proper divisors (732997).

20923588979 is an equidigital number, since it uses as much as digits as its factorization.

20923588979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732996.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 20923588979 in words is "twenty billion, nine hundred twenty-three million, five hundred eighty-eight thousand, nine hundred seventy-nine".