20128472773 has 2 divisors, whose sum is σ = 20128472774. Its totient is φ = 20128472772.

The previous prime is 20128472713. The next prime is 20128472797. The reversal of 20128472773 is 37727482102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16495035489 + 3633437284 = 128433^2 + 60278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20128472773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128472713) 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, 10064236386 + 10064236387.

It is an arithmetic number, because the mean of its divisors is an integer number (10064236387).

Almost surely, 2^20128472773 is an apocalyptic number.

It is an amenable number.

20128472773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128472773 is an equidigital number, since it uses as much as digits as its factorization.

20128472773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 263424, while the sum is 43.

The spelling of 20128472773 in words is "twenty billion, one hundred twenty-eight million, four hundred seventy-two thousand, seven hundred seventy-three".