20230209 has 8 divisors (see below), whose sum is σ = 29970720. Its totient is φ = 13486788.

The previous prime is 20230201. The next prime is 20230219. The reversal of 20230209 is 90203202.

It is not a de Polignac number, because 20230209 - 2³ = 20230201 is a prime.

It is a super-2 number, since 2×20230209² = 818522712367362, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20230191 and 20230200.

It is not an unprimeable number, because it can be changed into a prime (20230201) 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, 374607 + ... + 374660.

It is an arithmetic number, because the mean of its divisors is an integer number (3746340).

Almost surely, 2^20230209 is an apocalyptic number.

It is an amenable number.

20230209 is a deficient number, since it is larger than the sum of its proper divisors (9740511).

20230209 is an equidigital number, since it uses as much as digits as its factorization.

20230209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749276 (or 749270 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20230209 is about 4497.8004624483. The cubic root of 20230209 is about 272.4792633548.

The spelling of 20230209 in words is "twenty million, two hundred thirty thousand, two hundred nine".