20523189773 has 2 divisors, whose sum is σ = 20523189774. Its totient is φ = 20523189772.

The previous prime is 20523189763. The next prime is 20523189833. The reversal of 20523189773 is 37798132502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10979267524 + 9543922249 = 104782^2 + 97693^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523189773 - 2⁸ = 20523189517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20523189763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261594886 + 10261594887.

It is an arithmetic number, because the mean of its divisors is an integer number (10261594887).

Almost surely, 2^20523189773 is an apocalyptic number.

It is an amenable number.

20523189773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523189773 is an equidigital number, since it uses as much as digits as its factorization.

20523189773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 20523189773 in words is "twenty billion, five hundred twenty-three million, one hundred eighty-nine thousand, seven hundred seventy-three".