20528597 has 4 divisors (see below), whose sum is σ = 20710380. Its totient is φ = 20346816.

The previous prime is 20528593. The next prime is 20528623. The reversal of 20528597 is 79582502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79582502 = 2 ⋅39791251.

It can be written as a sum of positive squares in 2 ways, for example, as 1745041 + 18783556 = 1321^2 + 4334^2 .

It is a cyclic number.

It is not a de Polignac number, because 20528597 - 2² = 20528593 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 20528597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20528591) 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, 90722 + ... + 90947.

It is an arithmetic number, because the mean of its divisors is an integer number (5177595).

Almost surely, 2^20528597 is an apocalyptic number.

It is an amenable number.

20528597 is a deficient number, since it is larger than the sum of its proper divisors (181783).

20528597 is a wasteful number, since it uses less digits than its factorization.

20528597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181782.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 20528597 is about 4530.8494788505. The cubic root of 20528597 is about 273.8123859956.

The spelling of 20528597 in words is "twenty million, five hundred twenty-eight thousand, five hundred ninety-seven".