20636649853 has 2 divisors, whose sum is σ = 20636649854. Its totient is φ = 20636649852.

The previous prime is 20636649829. The next prime is 20636649863. The reversal of 20636649853 is 35894663602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19814222169 + 822427684 = 140763^2 + 28678^2 .

It is a cyclic number.

It is not a de Polignac number, because 20636649853 - 2⁵ = 20636649821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20636649853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636649863) 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, 10318324926 + 10318324927.

It is an arithmetic number, because the mean of its divisors is an integer number (10318324927).

Almost surely, 2^20636649853 is an apocalyptic number.

It is an amenable number.

20636649853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636649853 is an equidigital number, since it uses as much as digits as its factorization.

20636649853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 52.

The spelling of 20636649853 in words is "twenty billion, six hundred thirty-six million, six hundred forty-nine thousand, eight hundred fifty-three".