20324591 has 4 divisors (see below), whose sum is σ = 23228112. Its totient is φ = 17421072.

The previous prime is 20324573. The next prime is 20324609. The reversal of 20324591 is 19542302.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20324573) and next prime (20324609).

It is a cyclic number.

It is not a de Polignac number, because 20324591 - 2⁶ = 20324527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20324591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324891) 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 in 3 ways as a sum of consecutive naturals, for example, 1451750 + ... + 1451763.

It is an arithmetic number, because the mean of its divisors is an integer number (5807028).

Almost surely, 2^20324591 is an apocalyptic number.

20324591 is a deficient number, since it is larger than the sum of its proper divisors (2903521).

20324591 is an equidigital number, since it uses as much as digits as its factorization.

20324591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903520.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20324591 is about 4508.2802707906. The cubic root of 20324591 is about 272.9023475916.

Adding to 20324591 its reverse (19542302), we get a palindrome (39866893).

The spelling of 20324591 in words is "twenty million, three hundred twenty-four thousand, five hundred ninety-one".