220718 has 4 divisors (see below), whose sum is σ = 331080. Its totient is φ = 110358.

The previous prime is 220709. The next prime is 220721. The reversal of 220718 is 817022.

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

It is a self number, because there is not a number n which added to its sum of digits gives 220718.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220718.

It is an unprimeable number.

220718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55178 + ... + 55181.

It is an arithmetic number, because the mean of its divisors is an integer number (82770).

2²²⁰⁷¹⁸ is an apocalyptic number.

220718 is a deficient number, since it is larger than the sum of its proper divisors (110362).

220718 is a wasteful number, since it uses less digits than its factorization.

220718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110361.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 220718 is about 469.8063430819. The cubic root of 220718 is about 60.4337092362.

The spelling of 220718 in words is "two hundred twenty thousand, seven hundred eighteen".