220663993 has 4 divisors (see below), whose sum is σ = 240724368. Its totient is φ = 200603620.

The previous prime is 220663991. The next prime is 220663997. The reversal of 220663993 is 399366022.

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 not a de Polignac number, because 220663993 - 2¹ = 220663991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220663991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10030171 + ... + 10030192.

It is an arithmetic number, because the mean of its divisors is an integer number (60181092).

Almost surely, 2^220663993 is an apocalyptic number.

It is an amenable number.

220663993 is a deficient number, since it is larger than the sum of its proper divisors (20060375).

220663993 is a wasteful number, since it uses less digits than its factorization.

220663993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20060374.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 220663993 is about 14854.7633101305. The cubic root of 220663993 is about 604.2877970387.

The spelling of 220663993 in words is "two hundred twenty million, six hundred sixty-three thousand, nine hundred ninety-three".