220772909 has 4 divisors (see below), whose sum is σ = 252311904. Its totient is φ = 189233916.

The previous prime is 220772813. The next prime is 220772921. The reversal of 220772909 is 909277022.

220772909 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, and also an emirpimes, since its reverse is a distinct semiprime: 909277022 = 2 ⋅454638511.

It is a cyclic number.

It is not a de Polignac number, because 220772909 - 2¹² = 220768813 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 (220772309) 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, 15769487 + ... + 15769500.

It is an arithmetic number, because the mean of its divisors is an integer number (63077976).

Almost surely, 2^220772909 is an apocalyptic number.

It is an amenable number.

220772909 is a deficient number, since it is larger than the sum of its proper divisors (31538995).

220772909 is an equidigital number, since it uses as much as digits as its factorization.

220772909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31538994.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 220772909 is about 14858.4288873353. The cubic root of 220772909 is about 604.3872027507.

The spelling of 220772909 in words is "two hundred twenty million, seven hundred seventy-two thousand, nine hundred nine".