20636425853 has 2 divisors, whose sum is σ = 20636425854. Its totient is φ = 20636425852.

The previous prime is 20636425841. The next prime is 20636425951. The reversal of 20636425853 is 35852463602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18663111769 + 1973314084 = 136613^2 + 44422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20636425853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20636425813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318212926 + 10318212927.

It is an arithmetic number, because the mean of its divisors is an integer number (10318212927).

Almost surely, 2^20636425853 is an apocalyptic number.

It is an amenable number.

20636425853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636425853 is an equidigital number, since it uses as much as digits as its factorization.

20636425853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 20636425853 in words is "twenty billion, six hundred thirty-six million, four hundred twenty-five thousand, eight hundred fifty-three".