20065513 has 4 divisors (see below), whose sum is σ = 21609028. Its totient is φ = 18522000.

The previous prime is 20065489. The next prime is 20065531. The reversal of 20065513 is 31556002.

It is a happy number.

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 5419584 + 14645929 = 2328^2 + 3827^2 .

It is a cyclic number.

It is not a de Polignac number, because 20065513 - 2⁵ = 20065481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20065553) 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, 771738 + ... + 771763.

It is an arithmetic number, because the mean of its divisors is an integer number (5402257).

Almost surely, 2^20065513 is an apocalyptic number.

It is an amenable number.

20065513 is a deficient number, since it is larger than the sum of its proper divisors (1543515).

20065513 is a wasteful number, since it uses less digits than its factorization.

20065513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543514.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 20065513 is about 4479.4545426871. The cubic root of 20065513 is about 271.7378213673.

The spelling of 20065513 in words is "twenty million, sixty-five thousand, five hundred thirteen".