220813 has 8 divisors (see below), whose sum is σ = 241920. Its totient is φ = 200640.

The previous prime is 220811. The next prime is 220841. The reversal of 220813 is 318022.

It is a happy number.

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 220813 - 2¹ = 220811 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220811) 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 7 ways as a sum of consecutive naturals, for example, 318 + ... + 736.

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

2²²⁰⁸¹³ is an apocalyptic number.

It is an amenable number.

220813 is a deficient number, since it is larger than the sum of its proper divisors (21107).

220813 is a wasteful number, since it uses less digits than its factorization.

220813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 220813 is about 469.9074376939. The cubic root of 220813 is about 60.4423784867.

Adding to 220813 its reverse (318022), we get a palindrome (538835).

The spelling of 220813 in words is "two hundred twenty thousand, eight hundred thirteen".