20444243993 has 2 divisors, whose sum is σ = 20444243994. Its totient is φ = 20444243992.

The previous prime is 20444243927. The next prime is 20444244053. The reversal of 20444243993 is 39934244402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13617022864 + 6827221129 = 116692^2 + 82627^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444243993 - 2¹⁰ = 20444242969 is a prime.

It is a super-2 number, since 2×20444243993² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20444243093) 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 as a sum of consecutive naturals, namely, 10222121996 + 10222121997.

It is an arithmetic number, because the mean of its divisors is an integer number (10222121997).

Almost surely, 2^20444243993 is an apocalyptic number.

It is an amenable number.

20444243993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444243993 is an equidigital number, since it uses as much as digits as its factorization.

20444243993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 20444243993 in words is "twenty billion, four hundred forty-four million, two hundred forty-three thousand, nine hundred ninety-three".