20004543694493 has 2 divisors, whose sum is σ = 20004543694494. Its totient is φ = 20004543694492.

The previous prime is 20004543694391. The next prime is 20004543694549. The reversal of 20004543694493 is 39449634540002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19649378948644 + 355164745849 = 4432762^2 + 595957^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004543694493 - 2⁸ = 20004543694237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004543690493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002271847246 + 10002271847247.

It is an arithmetic number, because the mean of its divisors is an integer number (10002271847247).

Almost surely, 2^{20004543694493} is an apocalyptic number.

It is an amenable number.

20004543694493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004543694493 is an equidigital number, since it uses as much as digits as its factorization.

20004543694493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 53.

The spelling of 20004543694493 in words is "twenty trillion, four billion, five hundred forty-three million, six hundred ninety-four thousand, four hundred ninety-three".