20030209 has 8 divisors (see below), whose sum is σ = 20787368. Its totient is φ = 19284480.

The previous prime is 20030207. The next prime is 20030239. The reversal of 20030209 is 90203002.

It can be written as a sum of positive squares in 4 ways, for example, as 4601025 + 15429184 = 2145^2 + 3928^2 .

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 20030209 - 2¹ = 20030207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20030192 and 20030201.

It is not an unprimeable number, because it can be changed into a prime (20030203) 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, 799 + ... + 6379.

It is an arithmetic number, because the mean of its divisors is an integer number (2598421).

Almost surely, 2^20030209 is an apocalyptic number.

It is an amenable number.

20030209 is a deficient number, since it is larger than the sum of its proper divisors (757159).

20030209 is an equidigital number, since it uses as much as digits as its factorization.

20030209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20030209 is about 4475.5121494640. The cubic root of 20030209 is about 271.5783593109.

The spelling of 20030209 in words is "twenty million, thirty thousand, two hundred nine".