20525284 has 12 divisors (see below), whose sum is σ = 38682364. Its totient is φ = 9473184.

The previous prime is 20525261. The next prime is 20525287. The reversal of 20525284 is 48252502.

It can be written as a sum of positive squares in 2 ways, for example, as 3534400 + 16990884 = 1880^2 + 4122^2 .

It is not an unprimeable number, because it can be changed into a prime (20525287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197307 + ... + 197410.

Almost surely, 2^20525284 is an apocalyptic number.

It is an amenable number.

20525284 is a deficient number, since it is larger than the sum of its proper divisors (18157080).

20525284 is a wasteful number, since it uses less digits than its factorization.

20525284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394734 (or 394732 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 20525284 is about 4530.4838593687. The cubic root of 20525284 is about 273.7976554997.

Adding to 20525284 its reverse (48252502), we get a palindrome (68777786).

The spelling of 20525284 in words is "twenty million, five hundred twenty-five thousand, two hundred eighty-four".