20538523 has 8 divisors (see below), whose sum is σ = 21303296. Its totient is φ = 19780200.

The previous prime is 20538521. The next prime is 20538527. The reversal of 20538523 is 32583502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20538523 - 2¹ = 20538521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20538491 and 20538500.

It is not an unprimeable number, because it can be changed into a prime (20538521) 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 7 ways as a sum of consecutive naturals, for example, 5428 + ... + 8398.

It is an arithmetic number, because the mean of its divisors is an integer number (2662912).

Almost surely, 2^20538523 is an apocalyptic number.

20538523 is a deficient number, since it is larger than the sum of its proper divisors (764773).

20538523 is a wasteful number, since it uses less digits than its factorization.

20538523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 20538523 is about 4531.9447260530. The cubic root of 20538523 is about 273.8565101965.

The spelling of 20538523 in words is "twenty million, five hundred thirty-eight thousand, five hundred twenty-three".