20625636 has 24 divisors (see below), whose sum is σ = 48737920. Its totient is φ = 6787872.

The previous prime is 20625629. The next prime is 20625653. The reversal of 20625636 is 63652602.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9931 + ... + 11826.

Almost surely, 2^20625636 is an apocalyptic number.

It is an amenable number.

20625636 is an abundant number, since it is smaller than the sum of its proper divisors (28112284).

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

20625636 is a wasteful number, since it uses less digits than its factorization.

20625636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21843 (or 21841 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20625636 is about 4541.5455519019. The cubic root of 20625636 is about 274.2431464508.

The spelling of 20625636 in words is "twenty million, six hundred twenty-five thousand, six hundred thirty-six".