20530045 has 4 divisors (see below), whose sum is σ = 24636060. Its totient is φ = 16424032.

The previous prime is 20530039. The next prime is 20530093. The reversal of 20530045 is 54003502.

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 8328996 + 12201049 = 2886^2 + 3493^2 .

It is a cyclic number.

It is not a de Polignac number, because 20530045 - 2⁷ = 20529917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053000 + ... + 2053009.

It is an arithmetic number, because the mean of its divisors is an integer number (6159015).

Almost surely, 2^20530045 is an apocalyptic number.

It is an amenable number.

20530045 is a deficient number, since it is larger than the sum of its proper divisors (4106015).

20530045 is an equidigital number, since it uses as much as digits as its factorization.

20530045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106014.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20530045 is about 4531.0092694675. The cubic root of 20530045 is about 273.8188236983.

Adding to 20530045 its reverse (54003502), we get a palindrome (74533547).

The spelling of 20530045 in words is "twenty million, five hundred thirty thousand, forty-five".