20324257 has 8 divisors (see below), whose sum is σ = 20921472. Its totient is φ = 19734000.

The previous prime is 20324237. The next prime is 20324267. The reversal of 20324257 is 75242302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20324257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20324207) 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 7 ways as a sum of consecutive naturals, for example, 4507 + ... + 7807.

It is an arithmetic number, because the mean of its divisors is an integer number (2615184).

Almost surely, 2^20324257 is an apocalyptic number.

It is an amenable number.

20324257 is a deficient number, since it is larger than the sum of its proper divisors (597215).

20324257 is a wasteful number, since it uses less digits than its factorization.

20324257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20324257 is about 4508.2432276886. The cubic root of 20324257 is about 272.9008526884.

Adding to 20324257 its reverse (75242302), we get a palindrome (95566559).

The spelling of 20324257 in words is "twenty million, three hundred twenty-four thousand, two hundred fifty-seven".