220812 has 12 divisors (see below), whose sum is σ = 515256. Its totient is φ = 73600.

The previous prime is 220811. The next prime is 220841. The reversal of 220812 is 218022.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 220791 and 220800.

It is not an unprimeable number, because it can be changed into a prime (220811) 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, 9189 + ... + 9212.

It is an arithmetic number, because the mean of its divisors is an integer number (42938).

2²²⁰⁸¹² is an apocalyptic number.

It is an amenable number.

220812 is an abundant number, since it is smaller than the sum of its proper divisors (294444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220812 is a wasteful number, since it uses less digits than its factorization.

220812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18408 (or 18406 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 220812 is about 469.9063736533. The cubic root of 220812 is about 60.4422872444.

Adding to 220812 its reverse (218022), we get a palindrome (438834).

The spelling of 220812 in words is "two hundred twenty thousand, eight hundred twelve".