10220209 has 4 divisors (see below), whose sum is σ = 10572660. Its totient is φ = 9867760.

The previous prime is 10220159. The next prime is 10220239. The reversal of 10220209 is 90202201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7507600 + 2712609 = 2740^2 + 1647^2 .

It is a cyclic number.

It is not a de Polignac number, because 10220209 - 2¹¹ = 10218161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10220192 and 10220201.

It is not an unprimeable number, because it can be changed into a prime (10220239) 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, 176182 + ... + 176239.

It is an arithmetic number, because the mean of its divisors is an integer number (2643165).

Almost surely, 2^10220209 is an apocalyptic number.

It is an amenable number.

10220209 is a deficient number, since it is larger than the sum of its proper divisors (352451).

10220209 is an equidigital number, since it uses as much as digits as its factorization.

10220209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352450.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 10220209 is about 3196.9061606497. The cubic root of 10220209 is about 217.0134205635.

The spelling of 10220209 in words is "ten million, two hundred twenty thousand, two hundred nine".