20530025 has 12 divisors (see below), whose sum is σ = 25515852. Its totient is φ = 16386240.

The previous prime is 20530021. The next prime is 20530039. The reversal of 20530025 is 52003502.

It can be written as a sum of positive squares in 6 ways, for example, as 126736 + 20403289 = 356^2 + 4517^2 .

It is not a de Polignac number, because 20530025 - 2² = 20530021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20529985 and 20530012.

It is not an unprimeable number, because it can be changed into a prime (20530021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16319 + ... + 17531.

It is an arithmetic number, because the mean of its divisors is an integer number (2126321).

Almost surely, 2^20530025 is an apocalyptic number.

20530025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20530025 is a deficient number, since it is larger than the sum of its proper divisors (4985827).

20530025 is a wasteful number, since it uses less digits than its factorization.

20530025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 20530025 is about 4531.0070624531. The cubic root of 20530025 is about 273.8187347818.

Adding to 20530025 its reverse (52003502), we get a palindrome (72533527).

The spelling of 20530025 in words is "twenty million, five hundred thirty thousand, twenty-five".