20636136 has 24 divisors (see below), whose sum is σ = 55889730. Its totient is φ = 6878688.

The previous prime is 20636123. The next prime is 20636137. The reversal of 20636136 is 63163602.

20636136 is a `hidden beast` number, since 20 + 636 + 1 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18404100 + 2232036 = 4290^2 + 1494^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (20636137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143235 + ... + 143378.

Almost surely, 2^20636136 is an apocalyptic number.

It is an amenable number.

20636136 is an abundant number, since it is smaller than the sum of its proper divisors (35253594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20636136 is a wasteful number, since it uses less digits than its factorization.

20636136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286625 (or 286618 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20636136 is about 4542.7013989475. The cubic root of 20636136 is about 274.2896753520.

Adding to 20636136 its reverse (63163602), we get a palindrome (83799738).

The spelling of 20636136 in words is "twenty million, six hundred thirty-six thousand, one hundred thirty-six".