20525306 has 16 divisors (see below), whose sum is σ = 32029440. Its totient is φ = 9856080.

The previous prime is 20525303. The next prime is 20525311. The reversal of 20525306 is 60352502.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20525303) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4091 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (2001840).

Almost surely, 2^20525306 is an apocalyptic number.

20525306 is a deficient number, since it is larger than the sum of its proper divisors (11504134).

20525306 is a wasteful number, since it uses less digits than its factorization.

20525306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629.

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

The square root of 20525306 is about 4530.4862873647. The cubic root of 20525306 is about 273.7977533229.

Adding to 20525306 its reverse (60352502), we get a palindrome (80877808).

The spelling of 20525306 in words is "twenty million, five hundred twenty-five thousand, three hundred six".