20689204 has 12 divisors (see below), whose sum is σ = 38336004. Its totient is φ = 9736064.

The previous prime is 20689159. The next prime is 20689211. The reversal of 20689204 is 40298602.

It can be written as a sum of positive squares in 2 ways, for example, as 15840400 + 4848804 = 3980^2 + 2202^2 .

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 3 ways as a sum of consecutive naturals, for example, 152059 + ... + 152194.

It is an arithmetic number, because the mean of its divisors is an integer number (3194667).

Almost surely, 2^20689204 is an apocalyptic number.

It is an amenable number.

20689204 is a deficient number, since it is larger than the sum of its proper divisors (17646800).

20689204 is a wasteful number, since it uses less digits than its factorization.

20689204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304274 (or 304272 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20689204 is about 4548.5386664290. The cubic root of 20689204 is about 274.5245957017.

The spelling of 20689204 in words is "twenty million, six hundred eighty-nine thousand, two hundred four".