20027209 has 4 divisors (see below), whose sum is σ = 20673280. Its totient is φ = 19381140.

The previous prime is 20027179. The next prime is 20027213. The reversal of 20027209 is 90272002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20027209 - 2⁵ = 20027177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20027209.

It is not an unprimeable number, because it can be changed into a prime (20027219) 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, 322989 + ... + 323050.

It is an arithmetic number, because the mean of its divisors is an integer number (5168320).

Almost surely, 2^20027209 is an apocalyptic number.

It is an amenable number.

20027209 is a deficient number, since it is larger than the sum of its proper divisors (646071).

20027209 is an equidigital number, since it uses as much as digits as its factorization.

20027209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646070.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20027209 is about 4475.1769797406. The cubic root of 20027209 is about 271.5648001953.

The spelling of 20027209 in words is "twenty million, twenty-seven thousand, two hundred nine".