20444181 has 8 divisors (see below), whose sum is σ = 27325344. Its totient is φ = 13596240.

The previous prime is 20444153. The next prime is 20444191. The reversal of 20444181 is 18144402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20444181 is a prime.

It is a super-2 number, since 2×20444181² = 835929073521522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6831 + ... + 9356.

It is an arithmetic number, because the mean of its divisors is an integer number (3415668).

Almost surely, 2^20444181 is an apocalyptic number.

It is an amenable number.

20444181 is a deficient number, since it is larger than the sum of its proper divisors (6881163).

20444181 is a wasteful number, since it uses less digits than its factorization.

20444181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16611.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 20444181 is about 4521.5241899165. The cubic root of 20444181 is about 273.4365541475.

Adding to 20444181 its reverse (18144402), we get a palindrome (38588583).

The spelling of 20444181 in words is "twenty million, four hundred forty-four thousand, one hundred eighty-one".