20226209 has 8 divisors (see below), whose sum is σ = 21607560. Its totient is φ = 18866176.

The previous prime is 20226191. The next prime is 20226221. The reversal of 20226209 is 90262202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2795584 + 17430625 = 1672^2 + 4175^2 .

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 20226209 - 2¹² = 20222113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20226289) 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, 3344 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (2700945).

Almost surely, 2^20226209 is an apocalyptic number.

It is an amenable number.

20226209 is a deficient number, since it is larger than the sum of its proper divisors (1381351).

20226209 is a wasteful number, since it uses less digits than its factorization.

20226209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10659.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20226209 is about 4497.3557786771. The cubic root of 20226209 is about 272.4613035981.

The spelling of 20226209 in words is "twenty million, two hundred twenty-six thousand, two hundred nine".