20636238 has 16 divisors (see below), whose sum is σ = 47168640. Its totient is φ = 5896056.

The previous prime is 20636227. The next prime is 20636251. The reversal of 20636238 is 83263602.

It is a Curzon number.

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, 245628 + ... + 245711.

It is an arithmetic number, because the mean of its divisors is an integer number (2948040).

Almost surely, 2^20636238 is an apocalyptic number.

20636238 is an abundant number, since it is smaller than the sum of its proper divisors (26532402).

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

20636238 is a wasteful number, since it uses less digits than its factorization.

20636238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491351.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 20636238 is about 4542.7126257337. The cubic root of 20636238 is about 274.2901272696.

The spelling of 20636238 in words is "twenty million, six hundred thirty-six thousand, two hundred thirty-eight".