20521204 has 24 divisors (see below), whose sum is σ = 39344256. Its totient is φ = 9288000.

The previous prime is 20521181. The next prime is 20521217. The reversal of 20521204 is 40212502.

It is a super-2 number, since 2×20521204² = 842239627219232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11064 + ... + 12784.

It is an arithmetic number, because the mean of its divisors is an integer number (1639344).

Almost surely, 2^20521204 is an apocalyptic number.

It is an amenable number.

20521204 is a deficient number, since it is larger than the sum of its proper divisors (18823052).

20521204 is a wasteful number, since it uses less digits than its factorization.

20521204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20521204 is about 4530.0335539596. The cubic root of 20521204 is about 273.7795125358.

Adding to 20521204 its reverse (40212502), we get a palindrome (60733706).

The spelling of 20521204 in words is "twenty million, five hundred twenty-one thousand, two hundred four".