20245636 has 12 divisors (see below), whose sum is σ = 36294300. Its totient is φ = 9875840.

The previous prime is 20245619. The next prime is 20245637. The reversal of 20245636 is 63654202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5760000 + 14485636 = 2400^2 + 3806^2 .

It is not an unprimeable number, because it can be changed into a prime (20245637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61561 + ... + 61888.

It is an arithmetic number, because the mean of its divisors is an integer number (3024525).

Almost surely, 2^20245636 is an apocalyptic number.

It is an amenable number.

20245636 is a deficient number, since it is larger than the sum of its proper divisors (16048664).

20245636 is a wasteful number, since it uses less digits than its factorization.

20245636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123494 (or 123492 counting only the distinct ones).

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

The square root of 20245636 is about 4499.5150849842. The cubic root of 20245636 is about 272.5485074829.

Adding to 20245636 its reverse (63654202), we get a palindrome (83899838).

The spelling of 20245636 in words is "twenty million, two hundred forty-five thousand, six hundred thirty-six".