20320031 has 2 divisors, whose sum is σ = 20320032. Its totient is φ = 20320030.

The previous prime is 20320021. The next prime is 20320033. The reversal of 20320031 is 13002302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320031 - 2¹⁰ = 20319007 is a prime.

It is a super-2 number, since 2×20320031² = 825807319681922, which contains 22 as substring.

Together with 20320033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20319994 and 20320021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160015 + 10160016.

It is an arithmetic number, because the mean of its divisors is an integer number (10160016).

Almost surely, 2^20320031 is an apocalyptic number.

20320031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320031 is an equidigital number, since it uses as much as digits as its factorization.

20320031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20320031 is about 4507.7745063390. The cubic root of 20320031 is about 272.8819367211.

Adding to 20320031 its reverse (13002302), we get a palindrome (33322333).

The spelling of 20320031 in words is "twenty million, three hundred twenty thousand, thirty-one".