20444209993 has 2 divisors, whose sum is σ = 20444209994. Its totient is φ = 20444209992.

The previous prime is 20444209921. The next prime is 20444210023. The reversal of 20444209993 is 39990244402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17483979529 + 2960230464 = 132227^2 + 54408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20444209993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20444209913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222104996 + 10222104997.

It is an arithmetic number, because the mean of its divisors is an integer number (10222104997).

Almost surely, 2^20444209993 is an apocalyptic number.

It is an amenable number.

20444209993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444209993 is an equidigital number, since it uses as much as digits as its factorization.

20444209993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 20444209993 in words is "twenty billion, four hundred forty-four million, two hundred nine thousand, nine hundred ninety-three".