23420437 has 2 divisors, whose sum is σ = 23420438. Its totient is φ = 23420436.

The previous prime is 23420387. The next prime is 23420443. The reversal of 23420437 is 73402432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 5788836 = 4199^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 23420437 - 2¹⁹ = 22896149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23420447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11710218 + 11710219.

It is an arithmetic number, because the mean of its divisors is an integer number (11710219).

Almost surely, 2^23420437 is an apocalyptic number.

It is an amenable number.

23420437 is a deficient number, since it is larger than the sum of its proper divisors (1).

23420437 is an equidigital number, since it uses as much as digits as its factorization.

23420437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 25.

The square root of 23420437 is about 4839.4666028396. The cubic root of 23420437 is about 286.1090957459.

Adding to 23420437 its reverse (73402432), we get a palindrome (96822869).

The spelling of 23420437 in words is "twenty-three million, four hundred twenty thousand, four hundred thirty-seven".