20323210111 has 4 divisors (see below), whose sum is σ = 20343155400. Its totient is φ = 20303264824.

The previous prime is 20323210109. The next prime is 20323210129. The reversal of 20323210111 is 11101232302.

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 20323210111 - 2¹ = 20323210109 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 (20323210181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9971116 + ... + 9973153.

It is an arithmetic number, because the mean of its divisors is an integer number (5085788850).

Almost surely, 2^20323210111 is an apocalyptic number.

20323210111 is a deficient number, since it is larger than the sum of its proper divisors (19945289).

20323210111 is a wasteful number, since it uses less digits than its factorization.

20323210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19945288.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20323210111 its reverse (11101232302), we get a palindrome (31424442413).

The spelling of 20323210111 in words is "twenty billion, three hundred twenty-three million, two hundred ten thousand, one hundred eleven".