20004543694391 has 2 divisors, whose sum is σ = 20004543694392. Its totient is φ = 20004543694390.

The previous prime is 20004543694381. The next prime is 20004543694493. The reversal of 20004543694391 is 19349634540002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004543694391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004543694321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002271847195 + 10002271847196.

It is an arithmetic number, because the mean of its divisors is an integer number (10002271847196).

Almost surely, 2^{20004543694391} is an apocalyptic number.

20004543694391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004543694391 is an equidigital number, since it uses as much as digits as its factorization.

20004543694391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 20004543694391 in words is "twenty trillion, four billion, five hundred forty-three million, six hundred ninety-four thousand, three hundred ninety-one".