20031332231 has 4 divisors (see below), whose sum is σ = 20037931032. Its totient is φ = 20024733432.

The previous prime is 20031332221. The next prime is 20031332257. The reversal of 20031332231 is 13223313002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031332231 is a prime.

It is a super-2 number, since 2×20031332231² (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 (20031332221) 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, 3294845 + ... + 3300918.

It is an arithmetic number, because the mean of its divisors is an integer number (5009482758).

Almost surely, 2^20031332231 is an apocalyptic number.

20031332231 is a deficient number, since it is larger than the sum of its proper divisors (6598801).

20031332231 is an equidigital number, since it uses as much as digits as its factorization.

20031332231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598800.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20031332231 its reverse (13223313002), we get a palindrome (33254645233).

The spelling of 20031332231 in words is "twenty billion, thirty-one million, three hundred thirty-two thousand, two hundred thirty-one".