20320111 has 4 divisors (see below), whose sum is σ = 23222992. Its totient is φ = 17417232.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320111 is 11102302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20320111 - 2³ = 20320103 is a prime.

It is a super-2 number, since 2×20320111² = 825813822104642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320171) 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, 1451430 + ... + 1451443.

It is an arithmetic number, because the mean of its divisors is an integer number (5805748).

Almost surely, 2^20320111 is an apocalyptic number.

20320111 is a deficient number, since it is larger than the sum of its proper divisors (2902881).

20320111 is an equidigital number, since it uses as much as digits as its factorization.

20320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902880.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20320111 is about 4507.7833798886. The cubic root of 20320111 is about 272.8822948328.

Adding to 20320111 its reverse (11102302), we get a palindrome (31422413).

The spelling of 20320111 in words is "twenty million, three hundred twenty thousand, one hundred eleven".