20131332031 has 4 divisors (see below), whose sum is σ = 20202974064. Its totient is φ = 20059690000.

The previous prime is 20131331993. The next prime is 20131332041. The reversal of 20131332031 is 13023313102.

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 20131332031 - 2³¹ = 17983848383 is a prime.

It is a super-2 number, since 2×20131332031² (a number of 21 digits) 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 (20131332041) 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, 35820595 + ... + 35821156.

It is an arithmetic number, because the mean of its divisors is an integer number (5050743516).

Almost surely, 2^20131332031 is an apocalyptic number.

20131332031 is a deficient number, since it is larger than the sum of its proper divisors (71642033).

20131332031 is an equidigital number, since it uses as much as digits as its factorization.

20131332031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71642032.

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

Adding to 20131332031 its reverse (13023313102), we get a palindrome (33154645133).

The spelling of 20131332031 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-two thousand, thirty-one".