20031720773 has 2 divisors, whose sum is σ = 20031720774. Its totient is φ = 20031720772.

The previous prime is 20031720749. The next prime is 20031720781. The reversal of 20031720773 is 37702713002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12745732609 + 7285988164 = 112897^2 + 85358^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031720773 - 2¹⁰ = 20031719749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20031720703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015860386 + 10015860387.

It is an arithmetic number, because the mean of its divisors is an integer number (10015860387).

Almost surely, 2^20031720773 is an apocalyptic number.

It is an amenable number.

20031720773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20031720773 is an equidigital number, since it uses as much as digits as its factorization.

20031720773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 32.

The spelling of 20031720773 in words is "twenty billion, thirty-one million, seven hundred twenty thousand, seven hundred seventy-three".