20636112566 has 4 divisors (see below), whose sum is σ = 30954168852. Its totient is φ = 10318056282.

The previous prime is 20636112517. The next prime is 20636112569. The reversal of 20636112566 is 66521163602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636112569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5159028140 + ... + 5159028143.

It is an arithmetic number, because the mean of its divisors is an integer number (7738542213).

Almost surely, 2^20636112566 is an apocalyptic number.

20636112566 is a deficient number, since it is larger than the sum of its proper divisors (10318056286).

20636112566 is a wasteful number, since it uses less digits than its factorization.

20636112566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10318056285.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 20636112566 in words is "twenty billion, six hundred thirty-six million, one hundred twelve thousand, five hundred sixty-six".