20444143 has 4 divisors (see below), whose sum is σ = 20469808. Its totient is φ = 20418480.

The previous prime is 20444113. The next prime is 20444147. The reversal of 20444143 is 34144402.

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

It is a cyclic number.

It is not a de Polignac number, because 20444143 - 2⁵ = 20444111 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 (20444147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11598 + ... + 13243.

It is an arithmetic number, because the mean of its divisors is an integer number (5117452).

Almost surely, 2^20444143 is an apocalyptic number.

20444143 is a deficient number, since it is larger than the sum of its proper divisors (25665).

20444143 is an equidigital number, since it uses as much as digits as its factorization.

20444143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25664.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 20444143 is about 4521.5199877917. The cubic root of 20444143 is about 273.4363847334.

Adding to 20444143 its reverse (34144402), we get a palindrome (54588545).

The spelling of 20444143 in words is "twenty million, four hundred forty-four thousand, one hundred forty-three".