20041444991 has 2 divisors, whose sum is σ = 20041444992. Its totient is φ = 20041444990.

The previous prime is 20041444949. The next prime is 20041445023. The reversal of 20041444991 is 19944414002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20041444991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20041443991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020722495 + 10020722496.

It is an arithmetic number, because the mean of its divisors is an integer number (10020722496).

Almost surely, 2^20041444991 is an apocalyptic number.

20041444991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041444991 is an equidigital number, since it uses as much as digits as its factorization.

20041444991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

Adding to 20041444991 its reverse (19944414002), we get a palindrome (39985858993).

The spelling of 20041444991 in words is "twenty billion, forty-one million, four hundred forty-four thousand, nine hundred ninety-one".