20245645 has 16 divisors (see below), whose sum is σ = 28016640. Its totient is φ = 13757184.

The previous prime is 20245637. The next prime is 20245649. The reversal of 20245645 is 54654202.

It is not a de Polignac number, because 20245645 - 2³ = 20245637 is a prime.

It is a super-3 number, since 3×20245645³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20245649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1396 + ... + 6514.

It is an arithmetic number, because the mean of its divisors is an integer number (1751040).

Almost surely, 2^20245645 is an apocalyptic number.

It is an amenable number.

20245645 is a deficient number, since it is larger than the sum of its proper divisors (7770995).

20245645 is a wasteful number, since it uses less digits than its factorization.

20245645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5244.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 20245645 is about 4499.5160850918. The cubic root of 20245645 is about 272.5485478691.

Adding to 20245645 its reverse (54654202), we get a palindrome (74899847).

The spelling of 20245645 in words is "twenty million, two hundred forty-five thousand, six hundred forty-five".