20444111 has 2 divisors, whose sum is σ = 20444112. Its totient is φ = 20444110.

The previous prime is 20444087. The next prime is 20444113. The reversal of 20444111 is 11144402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20444111 is a prime.

Together with 20444113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20444111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222055 + 10222056.

It is an arithmetic number, because the mean of its divisors is an integer number (10222056).

Almost surely, 2^20444111 is an apocalyptic number.

20444111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444111 is an equidigital number, since it uses as much as digits as its factorization.

20444111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20444111 is about 4521.5164491573. The cubic root of 20444111 is about 273.4362420688.

Adding to 20444111 its reverse (11144402), we get a palindrome (31588513).

The spelling of 20444111 in words is "twenty million, four hundred forty-four thousand, one hundred eleven".