20312351 has 2 divisors, whose sum is σ = 20312352. Its totient is φ = 20312350.

The previous prime is 20312309. The next prime is 20312353. The reversal of 20312351 is 15321302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312351 - 2¹⁴ = 20295967 is a prime.

Together with 20312353, 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 (20312353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156175 + 10156176.

It is an arithmetic number, because the mean of its divisors is an integer number (10156176).

Almost surely, 2^20312351 is an apocalyptic number.

20312351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312351 is an equidigital number, since it uses as much as digits as its factorization.

20312351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20312351 is about 4506.9225642338. The cubic root of 20312351 is about 272.8475536148.

Adding to 20312351 its reverse (15321302), we get a palindrome (35633653).

The spelling of 20312351 in words is "twenty million, three hundred twelve thousand, three hundred fifty-one".