20444231 has 4 divisors (see below), whose sum is σ = 20456832. Its totient is φ = 20431632.

The previous prime is 20444227. The next prime is 20444233. The reversal of 20444231 is 13244402.

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 20444231 - 2² = 20444227 is a prime.

It is a super-2 number, since 2×20444231² = 835933162362722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444233) 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, 3431 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (5114208).

Almost surely, 2^20444231 is an apocalyptic number.

20444231 is a deficient number, since it is larger than the sum of its proper divisors (12601).

20444231 is a wasteful number, since it uses less digits than its factorization.

20444231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12600.

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

The square root of 20444231 is about 4521.5297190221. The cubic root of 20444231 is about 273.4367770604.

Adding to 20444231 its reverse (13244402), we get a palindrome (33688633).

The spelling of 20444231 in words is "twenty million, four hundred forty-four thousand, two hundred thirty-one".