20003231 has 2 divisors, whose sum is σ = 20003232. Its totient is φ = 20003230.

The previous prime is 20003227. The next prime is 20003267. The reversal of 20003231 is 13230002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20003231 - 2² = 20003227 is a prime.

It is a super-2 number, since 2×20003231² = 800258500878722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001615 + 10001616.

It is an arithmetic number, because the mean of its divisors is an integer number (10001616).

Almost surely, 2^20003231 is an apocalyptic number.

20003231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003231 is an equidigital number, since it uses as much as digits as its factorization.

20003231 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 20003231 is about 4472.4971771931. The cubic root of 20003231 is about 271.4563780113.

Adding to 20003231 its reverse (13230002), we get a palindrome (33233233).

The spelling of 20003231 in words is "twenty million, three thousand, two hundred thirty-one".