220987 has 8 divisors (see below), whose sum is σ = 241920. Its totient is φ = 200640.

The previous prime is 220973. The next prime is 221021. The reversal of 220987 is 789022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220987 - 2⁷ = 220859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220907) 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 7 ways as a sum of consecutive naturals, for example, 1062 + ... + 1252.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2²²⁰⁹⁸⁷ is an apocalyptic number.

220987 is a deficient number, since it is larger than the sum of its proper divisors (20933).

220987 is a wasteful number, since it uses less digits than its factorization.

220987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 220987 is about 470.0925440804. The cubic root of 220987 is about 60.4582504577.

The spelling of 220987 in words is "two hundred twenty thousand, nine hundred eighty-seven".