20444133197 has 2 divisors, whose sum is σ = 20444133198. Its totient is φ = 20444133196.

The previous prime is 20444133191. The next prime is 20444133221. The reversal of 20444133197 is 79133144402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20400123241 + 44009956 = 142829^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444133197 - 2⁴ = 20444133181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20444133197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444133191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222066598 + 10222066599.

It is an arithmetic number, because the mean of its divisors is an integer number (10222066599).

Almost surely, 2^20444133197 is an apocalyptic number.

It is an amenable number.

20444133197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444133197 is an equidigital number, since it uses as much as digits as its factorization.

20444133197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

Adding to 20444133197 its reverse (79133144402), we get a palindrome (99577277599).

The spelling of 20444133197 in words is "twenty billion, four hundred forty-four million, one hundred thirty-three thousand, one hundred ninety-seven".