20200409 has 8 divisors (see below), whose sum is σ = 20811840. Its totient is φ = 19592496.

The previous prime is 20200393. The next prime is 20200429. The reversal of 20200409 is 90400202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20200409 - 2⁴ = 20200393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20200429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14852 + ... + 16154.

It is an arithmetic number, because the mean of its divisors is an integer number (2601480).

Almost surely, 2^20200409 is an apocalyptic number.

It is an amenable number.

20200409 is a deficient number, since it is larger than the sum of its proper divisors (611431).

20200409 is a wasteful number, since it uses less digits than its factorization.

20200409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20200409 is about 4494.4865112713. The cubic root of 20200409 is about 272.3454062389.

The spelling of 20200409 in words is "twenty million, two hundred thousand, four hundred nine".