20544740167 has 4 divisors (see below), whose sum is σ = 23479703056. Its totient is φ = 17609777280.

The previous prime is 20544740129. The next prime is 20544740173. The reversal of 20544740167 is 76104744502.

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-20544740167 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 (20544740107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1467481434 + ... + 1467481447.

It is an arithmetic number, because the mean of its divisors is an integer number (5869925764).

Almost surely, 2^20544740167 is an apocalyptic number.

20544740167 is a deficient number, since it is larger than the sum of its proper divisors (2934962889).

20544740167 is an equidigital number, since it uses as much as digits as its factorization.

20544740167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934962888.

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 20544740167 in words is "twenty billion, five hundred forty-four million, seven hundred forty thousand, one hundred sixty-seven".