220748909 has 4 divisors (see below), whose sum is σ = 221858400. Its totient is φ = 219639420.

The previous prime is 220748881. The next prime is 220748911. The reversal of 220748909 is 909847022.

220748909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220748909 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 (220748959) 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, 554447 + ... + 554844.

It is an arithmetic number, because the mean of its divisors is an integer number (55464600).

Almost surely, 2^220748909 is an apocalyptic number.

It is an amenable number.

220748909 is a deficient number, since it is larger than the sum of its proper divisors (1109491).

220748909 is a wasteful number, since it uses less digits than its factorization.

220748909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109490.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 220748909 is about 14857.6212429850. The cubic root of 220748909 is about 604.3653011829.

The spelling of 220748909 in words is "two hundred twenty million, seven hundred forty-eight thousand, nine hundred nine".