20525517 has 12 divisors (see below), whose sum is σ = 30091360. Its totient is φ = 13479048.

The previous prime is 20525501. The next prime is 20525521. The reversal of 20525517 is 71552502.

It is a happy number.

It is not a de Polignac number, because 20525517 - 2⁴ = 20525501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525587) 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 11 ways as a sum of consecutive naturals, for example, 16417 + ... + 17622.

Almost surely, 2^20525517 is an apocalyptic number.

It is an amenable number.

20525517 is a deficient number, since it is larger than the sum of its proper divisors (9565843).

20525517 is a wasteful number, since it uses less digits than its factorization.

20525517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34112 (or 34109 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 20525517 is about 4530.5095739883. The cubic root of 20525517 is about 273.7986915327.

It can be divided in two parts, 2052 and 5517, that added together give a square (7569 = 87²).

The spelling of 20525517 in words is "twenty million, five hundred twenty-five thousand, five hundred seventeen".