20004245 has 32 divisors (see below), whose sum is σ = 26611200. Its totient is φ = 14382144.

The previous prime is 20004239. The next prime is 20004253. The reversal of 20004245 is 54240002.

It is a cyclic number.

It is not a de Polignac number, because 20004245 - 2¹⁴ = 19987861 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 240974 + ... + 241056.

It is an arithmetic number, because the mean of its divisors is an integer number (831600).

Almost surely, 2^20004245 is an apocalyptic number.

It is an amenable number.

20004245 is a deficient number, since it is larger than the sum of its proper divisors (6606955).

20004245 is a wasteful number, since it uses less digits than its factorization.

20004245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20004245 is about 4472.6105352467. The cubic root of 20004245 is about 271.4609648056.

Adding to 20004245 its reverse (54240002), we get a palindrome (74244247).

The spelling of 20004245 in words is "twenty million, four thousand, two hundred forty-five".