220606909 has 4 divisors (see below), whose sum is σ = 233583804. Its totient is φ = 207630016.

The previous prime is 220606901. The next prime is 220606931. The reversal of 220606909 is 909606022.

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 191684025 + 28922884 = 13845^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 220606909 - 2³ = 220606901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220606901) 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, 6488422 + ... + 6488455.

It is an arithmetic number, because the mean of its divisors is an integer number (58395951).

Almost surely, 2^220606909 is an apocalyptic number.

It is an amenable number.

220606909 is a deficient number, since it is larger than the sum of its proper divisors (12976895).

220606909 is a wasteful number, since it uses less digits than its factorization.

220606909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12976894.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 220606909 is about 14852.8417819621. The cubic root of 220606909 is about 604.2356844140.

The spelling of 220606909 in words is "two hundred twenty million, six hundred six thousand, nine hundred nine".