20444321 has 4 divisors (see below), whose sum is σ = 20453652. Its totient is φ = 20434992.

The previous prime is 20444293. The next prime is 20444327. The reversal of 20444321 is 12344402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17430625 + 3013696 = 4175^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444321 - 2⁶ = 20444257 is a prime.

It is a super-2 number, since 2×20444321² = 835940522302082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20444293 and 20444302.

It is not an unprimeable number, because it can be changed into a prime (20444327) 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, 611 + ... + 6423.

It is an arithmetic number, because the mean of its divisors is an integer number (5113413).

Almost surely, 2^20444321 is an apocalyptic number.

It is an amenable number.

20444321 is a deficient number, since it is larger than the sum of its proper divisors (9331).

20444321 is an equidigital number, since it uses as much as digits as its factorization.

20444321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9330.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20444321 is about 4521.5396713951. The cubic root of 20444321 is about 273.4371783028.

Adding to 20444321 its reverse (12344402), we get a palindrome (32788723).

The spelling of 20444321 in words is "twenty million, four hundred forty-four thousand, three hundred twenty-one".