20506775033 has 2 divisors, whose sum is σ = 20506775034. Its totient is φ = 20506775032.

The previous prime is 20506774987. The next prime is 20506775041. The reversal of 20506775033 is 33057760502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12220860304 + 8285914729 = 110548^2 + 91027^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506775033 - 2⁶ = 20506774969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20506775053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253387516 + 10253387517.

It is an arithmetic number, because the mean of its divisors is an integer number (10253387517).

Almost surely, 2^20506775033 is an apocalyptic number.

It is an amenable number.

20506775033 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506775033 is an equidigital number, since it uses as much as digits as its factorization.

20506775033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 38.

The spelling of 20506775033 in words is "twenty billion, five hundred six million, seven hundred seventy-five thousand, thirty-three".