20632321 has 4 divisors (see below), whose sum is σ = 20657200. Its totient is φ = 20607444.

The previous prime is 20632301. The next prime is 20632327. The reversal of 20632321 is 12323602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20632321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20632327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11151 + ... + 12868.

It is an arithmetic number, because the mean of its divisors is an integer number (5164300).

Almost surely, 2^20632321 is an apocalyptic number.

It is an amenable number.

20632321 is a deficient number, since it is larger than the sum of its proper divisors (24879).

20632321 is an equidigital number, since it uses as much as digits as its factorization.

20632321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24878.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20632321 is about 4542.2814752060. The cubic root of 20632321 is about 274.2727716771.

Adding to 20632321 its reverse (12323602), we get a palindrome (32955923).

The spelling of 20632321 in words is "twenty million, six hundred thirty-two thousand, three hundred twenty-one".