20575098979 has 4 divisors (see below), whose sum is σ = 20578343976. Its totient is φ = 20571853984.

The previous prime is 20575098953. The next prime is 20575098991. The reversal of 20575098979 is 97989057502.

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 20575098979 - 2¹³ = 20575090787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20575098179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1612969 + ... + 1625674.

It is an arithmetic number, because the mean of its divisors is an integer number (5144585994).

Almost surely, 2^20575098979 is an apocalyptic number.

20575098979 is a deficient number, since it is larger than the sum of its proper divisors (3244997).

20575098979 is an equidigital number, since it uses as much as digits as its factorization.

20575098979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244996.

The product of its (nonzero) digits is 14288400, while the sum is 61.

The spelling of 20575098979 in words is "twenty billion, five hundred seventy-five million, ninety-eight thousand, nine hundred seventy-nine".