20636144 has 20 divisors (see below), whose sum is σ = 40191624. Its totient is φ = 10264128.

The previous prime is 20636141. The next prime is 20636159. The reversal of 20636144 is 44163602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636141) 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 3 ways as a sum of consecutive naturals, for example, 122 + ... + 6425.

Almost surely, 2^20636144 is an apocalyptic number.

It is an amenable number.

20636144 is a deficient number, since it is larger than the sum of its proper divisors (19555480).

20636144 is a wasteful number, since it uses less digits than its factorization.

20636144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6752 (or 6746 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20636144 is about 4542.7022794808. The cubic root of 20636144 is about 274.2897107966.

Adding to 20636144 its reverse (44163602), we get a palindrome (64799746).

The spelling of 20636144 in words is "twenty million, six hundred thirty-six thousand, one hundred forty-four".