20536521 has 8 divisors (see below), whose sum is σ = 27566400. Its totient is φ = 13598832.

The previous prime is 20536519. The next prime is 20536547. The reversal of 20536521 is 12563502.

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

It is not a de Polignac number, because 20536521 - 2¹ = 20536519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20536491 and 20536500.

It is not an unprimeable number, because it can be changed into a prime (20536421) 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, 22525 + ... + 23418.

It is an arithmetic number, because the mean of its divisors is an integer number (3445800).

Almost surely, 2^20536521 is an apocalyptic number.

It is an amenable number.

20536521 is a deficient number, since it is larger than the sum of its proper divisors (7029879).

20536521 is a wasteful number, since it uses less digits than its factorization.

20536521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46095.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20536521 is about 4531.7238441900. The cubic root of 20536521 is about 273.8476118197.

The spelling of 20536521 in words is "twenty million, five hundred thirty-six thousand, five hundred twenty-one".