20342431 has 2 divisors, whose sum is σ = 20342432. Its totient is φ = 20342430.

The previous prime is 20342429. The next prime is 20342447. The reversal of 20342431 is 13424302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20342431 - 2¹ = 20342429 is a prime.

It is a super-2 number, since 2×20342431² = 827628997979522, which contains 22 as substring.

Together with 20342429, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20342399 and 20342408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20342411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171215 + 10171216.

It is an arithmetic number, because the mean of its divisors is an integer number (10171216).

Almost surely, 2^20342431 is an apocalyptic number.

20342431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20342431 is an equidigital number, since it uses as much as digits as its factorization.

20342431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20342431 is about 4510.2584183171. The cubic root of 20342431 is about 272.9821713234.

Adding to 20342431 its reverse (13424302), we get a palindrome (33766733).

It can be divided in two parts, 2034 and 2431, that added together give a triangular number (4465 = T₉₄).

The spelling of 20342431 in words is "twenty million, three hundred forty-two thousand, four hundred thirty-one".