20804127111 has 18 divisors (see below), whose sum is σ = 31922061392. Its totient is φ = 13053568320.

The previous prime is 20804127107. The next prime is 20804127137. The reversal of 20804127111 is 11172140802.

It is not a de Polignac number, because 20804127111 - 2² = 20804127107 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 (20804122111) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3996655 + ... + 4001856.

Almost surely, 2^20804127111 is an apocalyptic number.

20804127111 is a deficient number, since it is larger than the sum of its proper divisors (11117934281).

20804127111 is a wasteful number, since it uses less digits than its factorization.

20804127111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998551 (or 7998531 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

Adding to 20804127111 its reverse (11172140802), we get a palindrome (31976267913).

The spelling of 20804127111 in words is "twenty billion, eight hundred four million, one hundred twenty-seven thousand, one hundred eleven".