20559636 has 24 divisors (see below), whose sum is σ = 53303040. Its totient is φ = 6853176.

The previous prime is 20559611. The next prime is 20559641. The reversal of 20559636 is 63695502.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20559636.

It is a congruent number.

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, 95076 + ... + 95291.

It is an arithmetic number, because the mean of its divisors is an integer number (2220960).

Almost surely, 2^20559636 is an apocalyptic number.

It is an amenable number.

20559636 is an abundant number, since it is smaller than the sum of its proper divisors (32743404).

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

20559636 is a wasteful number, since it uses less digits than its factorization.

20559636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190380 (or 190372 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 20559636 is about 4534.2734809449. The cubic root of 20559636 is about 273.9503168837.

The spelling of 20559636 in words is "twenty million, five hundred fifty-nine thousand, six hundred thirty-six".