20320133131 has 4 divisors (see below), whose sum is σ = 20499957432. Its totient is φ = 20140308832.

The previous prime is 20320133117. The next prime is 20320133143. The reversal of 20320133131 is 13133102302.

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 20320133131 - 2²⁵ = 20286578699 is a prime.

It is a super-2 number, since 2×20320133131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320133099 and 20320133108.

It is not an unprimeable number, because it can be changed into a prime (20320133161) 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, 89911981 + ... + 89912206.

It is an arithmetic number, because the mean of its divisors is an integer number (5124989358).

Almost surely, 2^20320133131 is an apocalyptic number.

20320133131 is a deficient number, since it is larger than the sum of its proper divisors (179824301).

20320133131 is a wasteful number, since it uses less digits than its factorization.

20320133131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179824300.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20320133131 its reverse (13133102302), we get a palindrome (33453235433).

The spelling of 20320133131 in words is "twenty billion, three hundred twenty million, one hundred thirty-three thousand, one hundred thirty-one".