20044421 has 4 divisors (see below), whose sum is σ = 20090112. Its totient is φ = 19998732.

The previous prime is 20044397. The next prime is 20044447. The reversal of 20044421 is 12444002.

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 not a de Polignac number, because 20044421 - 2⁶ = 20044357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20044421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20044721) 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, 22181 + ... + 23066.

It is an arithmetic number, because the mean of its divisors is an integer number (5022528).

Almost surely, 2^20044421 is an apocalyptic number.

It is an amenable number.

20044421 is a deficient number, since it is larger than the sum of its proper divisors (45691).

20044421 is an equidigital number, since it uses as much as digits as its factorization.

20044421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45690.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20044421 is about 4477.0996191731. The cubic root of 20044421 is about 271.6425749689.

Adding to 20044421 its reverse (12444002), we get a palindrome (32488423).

The spelling of 20044421 in words is "twenty million, forty-four thousand, four hundred twenty-one".