20524532521 has 4 divisors (see below), whose sum is σ = 20597573844. Its totient is φ = 20451491200.

The previous prime is 20524532519. The next prime is 20524532549. The reversal of 20524532521 is 12523542502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9882546921 + 10641985600 = 99411^2 + 103160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20524532521 - 2¹ = 20524532519 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20524532221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36520240 + ... + 36520801.

It is an arithmetic number, because the mean of its divisors is an integer number (5149393461).

Almost surely, 2^20524532521 is an apocalyptic number.

It is an amenable number.

20524532521 is a deficient number, since it is larger than the sum of its proper divisors (73041323).

20524532521 is an equidigital number, since it uses as much as digits as its factorization.

20524532521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73041322.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 20524532521 in words is "twenty billion, five hundred twenty-four million, five hundred thirty-two thousand, five hundred twenty-one".