20320120311 has 4 divisors (see below), whose sum is σ = 27093493752. Its totient is φ = 13546746872.

The previous prime is 20320120309. The next prime is 20320120313. The reversal of 20320120311 is 11302102302.

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

It is an interprime number because it is at equal distance from previous prime (20320120309) and next prime (20320120313).

It is a cyclic number.

It is not a de Polignac number, because 20320120311 - 2¹ = 20320120309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320120313) 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, 3386686716 + ... + 3386686721.

It is an arithmetic number, because the mean of its divisors is an integer number (6773373438).

Almost surely, 2^20320120311 is an apocalyptic number.

20320120311 is a deficient number, since it is larger than the sum of its proper divisors (6773373441).

20320120311 is an equidigital number, since it uses as much as digits as its factorization.

20320120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6773373440.

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

Adding to 20320120311 its reverse (11302102302), we get a palindrome (31622222613).

The spelling of 20320120311 in words is "twenty billion, three hundred twenty million, one hundred twenty thousand, three hundred eleven".