20530331 has 2 divisors, whose sum is σ = 20530332. Its totient is φ = 20530330.

The previous prime is 20530327. The next prime is 20530333. The reversal of 20530331 is 13303502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20530331 - 2² = 20530327 is a prime.

It is a super-2 number, since 2×20530331² = 842988981939122, which contains 22 as substring.

Together with 20530333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20530333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265165 + 10265166.

It is an arithmetic number, because the mean of its divisors is an integer number (10265166).

Almost surely, 2^20530331 is an apocalyptic number.

20530331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20530331 is an equidigital number, since it uses as much as digits as its factorization.

20530331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 20530331 is about 4531.0408296549. The cubic root of 20530331 is about 273.8200951977.

Adding to 20530331 its reverse (13303502), we get a palindrome (33833833).

The spelling of 20530331 in words is "twenty million, five hundred thirty thousand, three hundred thirty-one".