20181136 has 10 divisors (see below), whose sum is σ = 39100982. Its totient is φ = 10090560.

The previous prime is 20181131. The next prime is 20181149. The reversal of 20181136 is 63118102.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 3041536 = 4140^2 + 1744^2 .

It is not an unprimeable number, because it can be changed into a prime (20181131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630645 + ... + 630676.

Almost surely, 2^20181136 is an apocalyptic number.

It is an amenable number.

20181136 is a deficient number, since it is larger than the sum of its proper divisors (18919846).

20181136 is a wasteful number, since it uses less digits than its factorization.

20181136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261329 (or 1261323 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20181136 is about 4492.3419282152. The cubic root of 20181136 is about 272.2587647058.

Adding to 20181136 its reverse (63118102), we get a palindrome (83299238).

The spelling of 20181136 in words is "twenty million, one hundred eighty-one thousand, one hundred thirty-six".