20504659479 has 4 divisors (see below), whose sum is σ = 27339545976. Its totient is φ = 13669772984.

The previous prime is 20504659477. The next prime is 20504659481. The reversal of 20504659479 is 97495640502.

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

It is an interprime number because it is at equal distance from previous prime (20504659477) and next prime (20504659481).

It is a cyclic number.

It is not a de Polignac number, because 20504659479 - 2¹ = 20504659477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20504659471) 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, 3417443244 + ... + 3417443249.

It is an arithmetic number, because the mean of its divisors is an integer number (6834886494).

Almost surely, 2^20504659479 is an apocalyptic number.

20504659479 is a deficient number, since it is larger than the sum of its proper divisors (6834886497).

20504659479 is an equidigital number, since it uses as much as digits as its factorization.

20504659479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834886496.

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 20504659479 in words is "twenty billion, five hundred four million, six hundred fifty-nine thousand, four hundred seventy-nine".