20636245 has 8 divisors (see below), whose sum is σ = 28301184. Its totient is φ = 14150544.

The previous prime is 20636227. The next prime is 20636251. The reversal of 20636245 is 54263602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20636245 - 2¹⁵ = 20603477 is a prime.

It is a Duffinian 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, 294769 + ... + 294838.

It is an arithmetic number, because the mean of its divisors is an integer number (3537648).

Almost surely, 2^20636245 is an apocalyptic number.

It is an amenable number.

20636245 is a deficient number, since it is larger than the sum of its proper divisors (7664939).

20636245 is an equidigital number, since it uses as much as digits as its factorization.

20636245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589619.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 20636245 is about 4542.7133961984. The cubic root of 20636245 is about 274.2901582835.

Adding to 20636245 its reverse (54263602), we get a palindrome (74899847).

The spelling of 20636245 in words is "twenty million, six hundred thirty-six thousand, two hundred forty-five".