20110823 has 2 divisors, whose sum is σ = 20110824. Its totient is φ = 20110822.

The previous prime is 20110819. The next prime is 20110837. The reversal of 20110823 is 32801102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20110823 - 2² = 20110819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055411 + 10055412.

It is an arithmetic number, because the mean of its divisors is an integer number (10055412).

Almost surely, 2^20110823 is an apocalyptic number.

20110823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110823 is an equidigital number, since it uses as much as digits as its factorization.

20110823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20110823 is about 4484.5092262142. The cubic root of 20110823 is about 271.9422049566.

Adding to 20110823 its reverse (32801102), we get a palindrome (52911925).

The spelling of 20110823 in words is "twenty million, one hundred ten thousand, eight hundred twenty-three".