20525169 has 12 divisors (see below), whose sum is σ = 31835184. Its totient is φ = 11728584.

The previous prime is 20525159. The next prime is 20525189. The reversal of 20525169 is 96152502.

It is a happy number.

It is not a de Polignac number, because 20525169 - 2¹² = 20521073 is a prime.

It is a super-2 number, since 2×20525169² = 842565124957122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20525129) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 69667 + ... + 69960.

It is an arithmetic number, because the mean of its divisors is an integer number (2652932).

Almost surely, 2^20525169 is an apocalyptic number.

It is an amenable number.

20525169 is a deficient number, since it is larger than the sum of its proper divisors (11310015).

20525169 is a wasteful number, since it uses less digits than its factorization.

20525169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139644 (or 139637 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 20525169 is about 4530.4711675498. The cubic root of 20525169 is about 273.7971441501.

The spelling of 20525169 in words is "twenty million, five hundred twenty-five thousand, one hundred sixty-nine".