20620636 has 6 divisors (see below), whose sum is σ = 36086120. Its totient is φ = 10310316.

The previous prime is 20620619. The next prime is 20620637. The reversal of 20620636 is 63602602.

It is a self number, because there is not a number n which added to its sum of digits gives 20620636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20620637) 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 as a sum of consecutive naturals, namely, 2577576 + ... + 2577583.

Almost surely, 2^20620636 is an apocalyptic number.

It is an amenable number.

20620636 is a deficient number, since it is larger than the sum of its proper divisors (15465484).

20620636 is a wasteful number, since it uses less digits than its factorization.

20620636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5155163 (or 5155161 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 20620636 is about 4540.9950451415. The cubic root of 20620636 is about 274.2209842809.

The spelling of 20620636 in words is "twenty million, six hundred twenty thousand, six hundred thirty-six".