20202209 has 4 divisors (see below), whose sum is σ = 20211504. Its totient is φ = 20192916.

The previous prime is 20202197. The next prime is 20202223. The reversal of 20202209 is 90220202.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20202209 - 2²⁰ = 19153633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20202229) 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, 554 + ... + 6380.

It is an arithmetic number, because the mean of its divisors is an integer number (5052876).

Almost surely, 2^20202209 is an apocalyptic number.

It is an amenable number.

20202209 is a deficient number, since it is larger than the sum of its proper divisors (9295).

20202209 is an equidigital number, since it uses as much as digits as its factorization.

20202209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9294.

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

The square root of 20202209 is about 4494.6867521553. The cubic root of 20202209 is about 272.3534953023.

The spelling of 20202209 in words is "twenty million, two hundred two thousand, two hundred nine".