20320320111 has 16 divisors (see below), whose sum is σ = 33346166784. Its totient is φ = 10718410464.

The previous prime is 20320320109. The next prime is 20320320143. The reversal of 20320320111 is 11102302302.

It is not a de Polignac number, because 20320320111 - 2¹ = 20320320109 is a prime.

It is a super-2 number, since 2×20320320111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320320511) 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 15 ways as a sum of consecutive naturals, for example, 37216431 + ... + 37216976.

It is an arithmetic number, because the mean of its divisors is an integer number (2084135424).

Almost surely, 2^20320320111 is an apocalyptic number.

20320320111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20320320111 is a deficient number, since it is larger than the sum of its proper divisors (13025846673).

20320320111 is a wasteful number, since it uses less digits than its factorization.

20320320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74433430.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20320320111 its reverse (11102302302), we get a palindrome (31422622413).

The spelling of 20320320111 in words is "twenty billion, three hundred twenty million, three hundred twenty thousand, one hundred eleven".