20636550 has 108 divisors (see below), whose sum is σ = 61102860. Its totient is φ = 4989600.

The previous prime is 20636549. The next prime is 20636563. The reversal of 20636550 is 5563602.

20636550 is a `hidden beast` number, since 2 + 0 + 6 + 3 + 655 + 0 = 666.

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 53 ways as a sum of consecutive naturals, for example, 54261 + ... + 54639.

Almost surely, 2^20636550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20636550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30551430).

20636550 is an abundant number, since it is smaller than the sum of its proper divisors (40466310).

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

20636550 is a wasteful number, since it uses less digits than its factorization.

20636550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 20636550 is about 4542.7469663189. The cubic root of 20636550 is about 274.2915095967.

The spelling of 20636550 in words is "twenty million, six hundred thirty-six thousand, five hundred fifty".