20804161727 has 4 divisors (see below), whose sum is σ = 20804734536. Its totient is φ = 20803588920.

The previous prime is 20804161711. The next prime is 20804161747. The reversal of 20804161727 is 72716140802.

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 20804161727 - 2⁴ = 20804161711 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 (20804161747) 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, 227948 + ... + 305889.

It is an arithmetic number, because the mean of its divisors is an integer number (5201183634).

Almost surely, 2^20804161727 is an apocalyptic number.

20804161727 is a deficient number, since it is larger than the sum of its proper divisors (572809).

20804161727 is an equidigital number, since it uses as much as digits as its factorization.

20804161727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572808.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 20804161727 in words is "twenty billion, eight hundred four million, one hundred sixty-one thousand, seven hundred twenty-seven".