20525717 has 4 divisors (see below), whose sum is σ = 20546880. Its totient is φ = 20504556.

The previous prime is 20525677. The next prime is 20525753. The reversal of 20525717 is 71752502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20525717 - 2⁶ = 20525653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20525717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9053 + ... + 11090.

It is an arithmetic number, because the mean of its divisors is an integer number (5136720).

Almost surely, 2^20525717 is an apocalyptic number.

It is an amenable number.

20525717 is a deficient number, since it is larger than the sum of its proper divisors (21163).

20525717 is a wasteful number, since it uses less digits than its factorization.

20525717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21162.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 20525717 is about 4530.5316465068. The cubic root of 20525717 is about 273.7995808251.

The spelling of 20525717 in words is "twenty million, five hundred twenty-five thousand, seven hundred seventeen".