20530256 has 20 divisors (see below), whose sum is σ = 40012692. Its totient is φ = 10204416.

The previous prime is 20530247. The next prime is 20530261. The reversal of 20530256 is 65203502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17774656 + 2755600 = 4216^2 + 1660^2 .

It is a super-2 number, since 2×20530256² = 842982822851072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 6476.

Almost surely, 2^20530256 is an apocalyptic number.

It is an amenable number.

20530256 is a deficient number, since it is larger than the sum of its proper divisors (19482436).

20530256 is a wasteful number, since it uses less digits than its factorization.

20530256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7598 (or 7592 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20530256 is about 4531.0325534033. The cubic root of 20530256 is about 273.8197617637.

Adding to 20530256 its reverse (65203502), we get a palindrome (85733758).

The spelling of 20530256 in words is "twenty million, five hundred thirty thousand, two hundred fifty-six".