20316623 has 2 divisors, whose sum is σ = 20316624. Its totient is φ = 20316622.

The previous prime is 20316587. The next prime is 20316631. The reversal of 20316623 is 32661302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20316623 - 2¹⁴ = 20300239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20316223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158311 + 10158312.

It is an arithmetic number, because the mean of its divisors is an integer number (10158312).

Almost surely, 2^20316623 is an apocalyptic number.

20316623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20316623 is an equidigital number, since it uses as much as digits as its factorization.

20316623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20316623 is about 4507.3964769033. The cubic root of 20316623 is about 272.8666802871.

Adding to 20316623 its reverse (32661302), we get a palindrome (52977925).

The spelling of 20316623 in words is "twenty million, three hundred sixteen thousand, six hundred twenty-three".