20204231 has 2 divisors, whose sum is σ = 20204232. Its totient is φ = 20204230.

The previous prime is 20204221. The next prime is 20204243. The reversal of 20204231 is 13240202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20204231 - 2⁶ = 20204167 is a prime.

It is a super-2 number, since 2×20204231² = 816421900602722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20204221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102115 + 10102116.

It is an arithmetic number, because the mean of its divisors is an integer number (10102116).

Almost surely, 2^20204231 is an apocalyptic number.

20204231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204231 is an equidigital number, since it uses as much as digits as its factorization.

20204231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20204231 is about 4494.9116787763. The cubic root of 20204231 is about 272.3625814439.

Adding to 20204231 its reverse (13240202), we get a palindrome (33444433).

The spelling of 20204231 in words is "twenty million, two hundred four thousand, two hundred thirty-one".