20524513 has 4 divisors (see below), whose sum is σ = 20727828. Its totient is φ = 20321200.

The previous prime is 20524499. The next prime is 20524519. The reversal of 20524513 is 31542502.

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 14653584 + 5870929 = 3828^2 + 2423^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20524513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20524519) 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 3 ways as a sum of consecutive naturals, for example, 101506 + ... + 101707.

It is an arithmetic number, because the mean of its divisors is an integer number (5181957).

Almost surely, 2^20524513 is an apocalyptic number.

It is an amenable number.

20524513 is a deficient number, since it is larger than the sum of its proper divisors (203315).

20524513 is a wasteful number, since it uses less digits than its factorization.

20524513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203314.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20524513 is about 4530.3987683205. The cubic root of 20524513 is about 273.7942271974.

The spelling of 20524513 in words is "twenty million, five hundred twenty-four thousand, five hundred thirteen".