20507423773 has 2 divisors, whose sum is σ = 20507423774. Its totient is φ = 20507423772.

The previous prime is 20507423701. The next prime is 20507423777. The reversal of 20507423773 is 37732470502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12407063769 + 8100360004 = 111387^2 + 90002^2 .

It is a cyclic number.

It is not a de Polignac number, because 20507423773 - 2²⁵ = 20473869341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20507423777) 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, 10253711886 + 10253711887.

It is an arithmetic number, because the mean of its divisors is an integer number (10253711887).

Almost surely, 2^20507423773 is an apocalyptic number.

It is an amenable number.

20507423773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20507423773 is an equidigital number, since it uses as much as digits as its factorization.

20507423773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 40.

The spelling of 20507423773 in words is "twenty billion, five hundred seven million, four hundred twenty-three thousand, seven hundred seventy-three".