20004543694479 has 4 divisors (see below), whose sum is σ = 26672724925976. Its totient is φ = 13336362462984.

The previous prime is 20004543694391. The next prime is 20004543694493. The reversal of 20004543694479 is 97449634540002.

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

It is not a de Polignac number, because 20004543694479 - 2²⁰ = 20004542645903 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 (20004543694679) 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, 3334090615744 + ... + 3334090615749.

It is an arithmetic number, because the mean of its divisors is an integer number (6668181231494).

Almost surely, 2^{20004543694479} is an apocalyptic number.

20004543694479 is a deficient number, since it is larger than the sum of its proper divisors (6668181231497).

20004543694479 is an equidigital number, since it uses as much as digits as its factorization.

20004543694479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668181231496.

The product of its (nonzero) digits is 26127360, while the sum is 57.

The spelling of 20004543694479 in words is "twenty trillion, four billion, five hundred forty-three million, six hundred ninety-four thousand, four hundred seventy-nine".