20904767567 has 4 divisors (see below), whose sum is σ = 21191134320. Its totient is φ = 20618400816.

The previous prime is 20904767561. The next prime is 20904767579. The reversal of 20904767567 is 76576740902.

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 20904767567 - 2⁸ = 20904767311 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 (20904767561) 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, 143183267 + ... + 143183412.

It is an arithmetic number, because the mean of its divisors is an integer number (5297783580).

Almost surely, 2^20904767567 is an apocalyptic number.

20904767567 is a deficient number, since it is larger than the sum of its proper divisors (286366753).

20904767567 is an equidigital number, since it uses as much as digits as its factorization.

20904767567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286366752.

The product of its (nonzero) digits is 4445280, while the sum is 53.

The spelling of 20904767567 in words is "twenty billion, nine hundred four million, seven hundred sixty-seven thousand, five hundred sixty-seven".