220443581 has 4 divisors (see below), whose sum is σ = 220474752. Its totient is φ = 220412412.

The previous prime is 220443571. The next prime is 220443623. The reversal of 220443581 is 185344022.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 220443581 - 2²² = 216249277 is a prime.

It is a super-2 number, since 2×220443581² = 97190744808207122, 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 (220443571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686 + ... + 21008.

It is an arithmetic number, because the mean of its divisors is an integer number (55118688).

Almost surely, 2^220443581 is an apocalyptic number.

It is an amenable number.

220443581 is a deficient number, since it is larger than the sum of its proper divisors (31171).

220443581 is a wasteful number, since it uses less digits than its factorization.

220443581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31170.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 220443581 is about 14847.3425568349. The cubic root of 220443581 is about 604.0865307734.

The spelling of 220443581 in words is "two hundred twenty million, four hundred forty-three thousand, five hundred eighty-one".