20235431 has 2 divisors, whose sum is σ = 20235432. Its totient is φ = 20235430.

The previous prime is 20235421. The next prime is 20235433. The reversal of 20235431 is 13453202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20235431 is a prime.

It is a super-2 number, since 2×20235431² = 818945335511522, which contains 22 as substring.

Together with 20235433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20235433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117715 + 10117716.

It is an arithmetic number, because the mean of its divisors is an integer number (10117716).

Almost surely, 2^20235431 is an apocalyptic number.

20235431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20235431 is an equidigital number, since it uses as much as digits as its factorization.

20235431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20235431 is about 4498.3809309573. The cubic root of 20235431 is about 272.5027062549.

Adding to 20235431 its reverse (13453202), we get a palindrome (33688633).

The spelling of 20235431 in words is "twenty million, two hundred thirty-five thousand, four hundred thirty-one".