20045438057 has 2 divisors, whose sum is σ = 20045438058. Its totient is φ = 20045438056.

The previous prime is 20045438003. The next prime is 20045438093. The reversal of 20045438057 is 75083454002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17010419776 + 3035018281 = 130424^2 + 55091^2 .

It is a cyclic number.

It is not a de Polignac number, because 20045438057 - 2²⁰ = 20044389481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20045438057.

It is not a weakly prime, because it can be changed into another prime (20045438657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022719028 + 10022719029.

It is an arithmetic number, because the mean of its divisors is an integer number (10022719029).

Almost surely, 2^20045438057 is an apocalyptic number.

It is an amenable number.

20045438057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045438057 is an equidigital number, since it uses as much as digits as its factorization.

20045438057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 38.

The spelling of 20045438057 in words is "twenty billion, forty-five million, four hundred thirty-eight thousand, fifty-seven".