220785 has 16 divisors (see below), whose sum is σ = 362880. Its totient is φ = 114560.

The previous prime is 220783. The next prime is 220789. The reversal of 220785 is 587022.

It is not a de Polignac number, because 220785 - 2¹ = 220783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220783) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 436 + ... + 794.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2²²⁰⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

220785 is a deficient number, since it is larger than the sum of its proper divisors (142095).

220785 is a wasteful number, since it uses less digits than its factorization.

220785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 220785 is about 469.8776436478. The cubic root of 220785 is about 60.4398235977.

The spelling of 220785 in words is "two hundred twenty thousand, seven hundred eighty-five".