20113656 has 16 divisors (see below), whose sum is σ = 50284200. Its totient is φ = 6704544.

The previous prime is 20113651. The next prime is 20113673. The reversal of 20113656 is 65631102.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 838069 = 20113656 / (2 + 0 + 1 + 1 + 3 + 6 + 5 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113651) 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, 419011 + ... + 419058.

Almost surely, 2^20113656 is an apocalyptic number.

It is an amenable number.

20113656 is an abundant number, since it is smaller than the sum of its proper divisors (30170544).

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

20113656 is a wasteful number, since it uses less digits than its factorization.

20113656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838078 (or 838074 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20113656 is about 4484.8250802010. The cubic root of 20113656 is about 271.9549738041.

Adding to 20113656 its reverse (65631102), we get a palindrome (85744758).

The spelling of 20113656 in words is "twenty million, one hundred thirteen thousand, six hundred fifty-six".