20065009 has 4 divisors (see below), whose sum is σ = 20116980. Its totient is φ = 20013040.

The previous prime is 20064997. The next prime is 20065033. The reversal of 20065009 is 90056002.

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 1617984 + 18447025 = 1272^2 + 4295^2 .

It is a cyclic number.

It is not a de Polignac number, because 20065009 - 2⁵ = 20064977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20065069) 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, 25402 + ... + 26179.

It is an arithmetic number, because the mean of its divisors is an integer number (5029245).

Almost surely, 2^20065009 is an apocalyptic number.

It is an amenable number.

20065009 is a deficient number, since it is larger than the sum of its proper divisors (51971).

20065009 is an equidigital number, since it uses as much as digits as its factorization.

20065009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51970.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20065009 is about 4479.3982854843. The cubic root of 20065009 is about 271.7355462031.

Adding to 20065009 its reverse (90056002), we get a palindrome (110121011).

The spelling of 20065009 in words is "twenty million, sixty-five thousand, nine".