20204285 has 8 divisors (see below), whose sum is σ = 24275160. Its totient is φ = 16143424.

The previous prime is 20204273. The next prime is 20204293. The reversal of 20204285 is 58240202.

It can be written as a sum of positive squares in 4 ways, for example, as 80089 + 20124196 = 283^2 + 4486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20204285 - 2⁴ = 20204269 is a prime.

It is a super-2 number, since 2×20204285² = 816426264722450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20204285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3071 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (3034395).

Almost surely, 2^20204285 is an apocalyptic number.

It is an amenable number.

20204285 is a deficient number, since it is larger than the sum of its proper divisors (4070875).

20204285 is a wasteful number, since it uses less digits than its factorization.

20204285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5007.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20204285 is about 4494.9176855644. The cubic root of 20204285 is about 272.3628240922.

Adding to 20204285 its reverse (58240202), we get a palindrome (78444487).

The spelling of 20204285 in words is "twenty million, two hundred four thousand, two hundred eighty-five".