220556909 has 8 divisors (see below), whose sum is σ = 227842560. Its totient is φ = 213282000.

The previous prime is 220556849. The next prime is 220556911. The reversal of 220556909 is 909655022.

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 220556909 - 2¹⁶ = 220491373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220556989) 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, 77687 + ... + 80475.

It is an arithmetic number, because the mean of its divisors is an integer number (28480320).

Almost surely, 2^220556909 is an apocalyptic number.

It is an amenable number.

220556909 is a deficient number, since it is larger than the sum of its proper divisors (7285651).

220556909 is a wasteful number, since it uses less digits than its factorization.

220556909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5371.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 220556909 is about 14851.1585069987. The cubic root of 220556909 is about 604.1900314663.

The spelling of 220556909 in words is "two hundred twenty million, five hundred fifty-six thousand, nine hundred nine".