20444111431 has 4 divisors (see below), whose sum is σ = 20444488864. Its totient is φ = 20443734000.

The previous prime is 20444111399. The next prime is 20444111449. The reversal of 20444111431 is 13411144402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13411144402 = 2 ⋅6705572201.

It is a cyclic number.

It is not a de Polignac number, because 20444111431 - 2⁵ = 20444111399 is a prime.

It is a super-2 number, since 2×20444111431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20444111396 and 20444111405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444111231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90390 + ... + 221491.

It is an arithmetic number, because the mean of its divisors is an integer number (5111122216).

Almost surely, 2^20444111431 is an apocalyptic number.

20444111431 is a deficient number, since it is larger than the sum of its proper divisors (377433).

20444111431 is an equidigital number, since it uses as much as digits as its factorization.

20444111431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377432.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 20444111431 its reverse (13411144402), we get a palindrome (33855255833).

The spelling of 20444111431 in words is "twenty billion, four hundred forty-four million, one hundred eleven thousand, four hundred thirty-one".