20244421 has 4 divisors (see below), whose sum is σ = 20286144. Its totient is φ = 20202700.

The previous prime is 20244409. The next prime is 20244431. The reversal of 20244421 is 12444202.

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 20244421 - 2¹¹ = 20242373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20244431) 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, 20125 + ... + 21106.

It is an arithmetic number, because the mean of its divisors is an integer number (5071536).

Almost surely, 2^20244421 is an apocalyptic number.

It is an amenable number.

20244421 is a deficient number, since it is larger than the sum of its proper divisors (41723).

20244421 is an equidigital number, since it uses as much as digits as its factorization.

20244421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41722.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 20244421 is about 4499.3800684094. The cubic root of 20244421 is about 272.5430552287.

Adding to 20244421 its reverse (12444202), we get a palindrome (32688623).

The spelling of 20244421 in words is "twenty million, two hundred forty-four thousand, four hundred twenty-one".