220979 has 4 divisors (see below), whose sum is σ = 241080. Its totient is φ = 200880.

The previous prime is 220973. The next prime is 221021. The reversal of 220979 is 979022.

It is a happy number.

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 220979 - 2¹⁶ = 155443 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 (220973) 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, 10034 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (60270).

2²²⁰⁹⁷⁹ is an apocalyptic number.

220979 is a deficient number, since it is larger than the sum of its proper divisors (20101).

220979 is a wasteful number, since it uses less digits than its factorization.

220979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20100.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 220979 is about 470.0840350405. The cubic root of 220979 is about 60.4575208947.

The spelling of 220979 in words is "two hundred twenty thousand, nine hundred seventy-nine".