220328791 has 4 divisors (see below), whose sum is σ = 224485992. Its totient is φ = 216171592.

The previous prime is 220328677. The next prime is 220328803. The reversal of 220328791 is 197823022.

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

It is a cyclic number.

It is not a de Polignac number, because 220328791 - 2⁷ = 220328663 is a prime.

It is a super-2 number, since 2×220328791² = 97089552287043362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220328291) 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, 2078521 + ... + 2078626.

It is an arithmetic number, because the mean of its divisors is an integer number (56121498).

Almost surely, 2^220328791 is an apocalyptic number.

220328791 is a deficient number, since it is larger than the sum of its proper divisors (4157201).

220328791 is an equidigital number, since it uses as much as digits as its factorization.

220328791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157200.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 220328791 is about 14843.4763785307. The cubic root of 220328791 is about 603.9816586904.

The spelling of 220328791 in words is "two hundred twenty million, three hundred twenty-eight thousand, seven hundred ninety-one".