20021204 has 18 divisors (see below), whose sum is σ = 40757850. Its totient is φ = 8580432.

The previous prime is 20021203. The next prime is 20021213. The reversal of 20021204 is 40212002.

It can be written as a sum of positive squares in only one way, i.e., 12945604 + 7075600 = 3598^2 + 2660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50879 + ... + 51270.

It is an arithmetic number, because the mean of its divisors is an integer number (2264325).

Almost surely, 2^20021204 is an apocalyptic number.

It is an amenable number.

20021204 is an abundant number, since it is smaller than the sum of its proper divisors (20736646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021204 is a wasteful number, since it uses less digits than its factorization.

20021204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102167 (or 102158 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20021204 is about 4474.5060062537. The cubic root of 20021204 is about 271.5376552972.

Adding to 20021204 its reverse (40212002), we get a palindrome (60233206).

The spelling of 20021204 in words is "twenty million, twenty-one thousand, two hundred four".