20730285 has 12 divisors (see below), whose sum is σ = 35932572. Its totient is φ = 11056128.

The previous prime is 20730277. The next prime is 20730313. The reversal of 20730285 is 58203702.

It can be written as a sum of positive squares in 2 ways, for example, as 14243076 + 6487209 = 3774^2 + 2547^2 .

It is not a de Polignac number, because 20730285 - 2³ = 20730277 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 11 ways as a sum of consecutive naturals, for example, 230292 + ... + 230381.

It is an arithmetic number, because the mean of its divisors is an integer number (2994381).

Almost surely, 2^20730285 is an apocalyptic number.

It is an amenable number.

20730285 is a deficient number, since it is larger than the sum of its proper divisors (15202287).

20730285 is a wasteful number, since it uses less digits than its factorization.

20730285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460684 (or 460681 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20730285 is about 4553.0522729264. The cubic root of 20730285 is about 274.7061765346.

Adding to 20730285 its reverse (58203702), we get a palindrome (78933987).

The spelling of 20730285 in words is "twenty million, seven hundred thirty thousand, two hundred eighty-five".