20444431 has 4 divisors (see below), whose sum is σ = 23365072. Its totient is φ = 17523792.

The previous prime is 20444429. The next prime is 20444471. The reversal of 20444431 is 13444402.

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 20444431 - 2¹ = 20444429 is a prime.

It is a super-2 number, since 2×20444431² = 835949517827522, 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 (20444471) 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, 1460310 + ... + 1460323.

It is an arithmetic number, because the mean of its divisors is an integer number (5841268).

Almost surely, 2^20444431 is an apocalyptic number.

20444431 is a deficient number, since it is larger than the sum of its proper divisors (2920641).

20444431 is an equidigital number, since it uses as much as digits as its factorization.

20444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920640.

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

The square root of 20444431 is about 4521.5518353769. The cubic root of 20444431 is about 273.4376687085.

Adding to 20444431 its reverse (13444402), we get a palindrome (33888833).

The spelling of 20444431 in words is "twenty million, four hundred forty-four thousand, four hundred thirty-one".