20575013 has 4 divisors (see below), whose sum is σ = 20778828. Its totient is φ = 20371200.

The previous prime is 20574973. The next prime is 20575031. The reversal of 20575013 is 31057502.

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 15108769 + 5466244 = 3887^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 20575013 - 2¹⁰ = 20573989 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 20575013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575073) 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, 101756 + ... + 101957.

It is an arithmetic number, because the mean of its divisors is an integer number (5194707).

Almost surely, 2^20575013 is an apocalyptic number.

It is an amenable number.

20575013 is a deficient number, since it is larger than the sum of its proper divisors (203815).

20575013 is a wasteful number, since it uses less digits than its factorization.

20575013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203814.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20575013 is about 4535.9688050074. The cubic root of 20575013 is about 274.0185976685.

The spelling of 20575013 in words is "twenty million, five hundred seventy-five thousand, thirteen".