20525171 has 4 divisors (see below), whose sum is σ = 21732552. Its totient is φ = 19317792.

The previous prime is 20525159. The next prime is 20525189. The reversal of 20525171 is 17152502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20525171 - 2¹⁸ = 20263027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20525101) 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, 603665 + ... + 603698.

It is an arithmetic number, because the mean of its divisors is an integer number (5433138).

Almost surely, 2^20525171 is an apocalyptic number.

20525171 is a deficient number, since it is larger than the sum of its proper divisors (1207381).

20525171 is a wasteful number, since it uses less digits than its factorization.

20525171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207380.

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 20525171 is about 4530.4713882774. The cubic root of 20525171 is about 273.7971530432.

Adding to 20525171 its reverse (17152502), we get a palindrome (37677673).

The spelling of 20525171 in words is "twenty million, five hundred twenty-five thousand, one hundred seventy-one".