20342321 has 4 divisors (see below), whose sum is σ = 20421732. Its totient is φ = 20262912.

The previous prime is 20342317. The next prime is 20342347. The reversal of 20342321 is 12324302.

20342321 is nontrivially palindromic in base 16.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18490000 + 1852321 = 4300^2 + 1361^2 .

It is a cyclic number.

It is not a de Polignac number, because 20342321 - 2² = 20342317 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 20342321.

It is not an unprimeable number, because it can be changed into a prime (20342351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39320 + ... + 39833.

It is an arithmetic number, because the mean of its divisors is an integer number (5105433).

Almost surely, 2^20342321 is an apocalyptic number.

It is an amenable number.

20342321 is a deficient number, since it is larger than the sum of its proper divisors (79411).

20342321 is an equidigital number, since it uses as much as digits as its factorization.

20342321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79410.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20342321 is about 4510.2462238774. The cubic root of 20342321 is about 272.9816792797.

Adding to 20342321 its reverse (12324302), we get a palindrome (32666623).

It can be divided in two parts, 203 and 42321, that added together give a palindrome (42524).

The spelling of 20342321 in words is "twenty million, three hundred forty-two thousand, three hundred twenty-one".