20525205 has 16 divisors (see below), whose sum is σ = 34772544. Its totient is φ = 10302720.

The previous prime is 20525189. The next prime is 20525213. The reversal of 20525205 is 50252502.

It is not a de Polignac number, because 20525205 - 2⁴ = 20525189 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 39991 + ... + 40500.

It is an arithmetic number, because the mean of its divisors is an integer number (2173284).

Almost surely, 2^20525205 is an apocalyptic number.

It is an amenable number.

20525205 is a deficient number, since it is larger than the sum of its proper divisors (14247339).

20525205 is a wasteful number, since it uses less digits than its factorization.

20525205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80516.

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 20525205 is about 4530.4751406447. The cubic root of 20525205 is about 273.7973042250.

Adding to 20525205 its reverse (50252502), we get a palindrome (70777707).

The spelling of 20525205 in words is "twenty million, five hundred twenty-five thousand, two hundred five".