2020009 has 4 divisors (see below), whose sum is σ = 2029060. Its totient is φ = 2010960.

The previous prime is 2020003. The next prime is 2020019. The reversal of 2020009 is 9000202.

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 1625625 + 394384 = 1275^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020009 - 2³ = 2020001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020001) 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, 4182 + ... + 4639.

It is an arithmetic number, because the mean of its divisors is an integer number (507265).

2^2020009 is an apocalyptic number.

It is an amenable number.

2020009 is a deficient number, since it is larger than the sum of its proper divisors (9051).

2020009 is an equidigital number, since it uses as much as digits as its factorization.

2020009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9050.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 2020009 is about 1421.2702065406. The cubic root of 2020009 is about 126.4108742247.

The spelling of 2020009 in words is "two million, twenty thousand, nine".