220406 has 8 divisors (see below), whose sum is σ = 332904. Its totient is φ = 109440.

The previous prime is 220403. The next prime is 220411. The reversal of 220406 is 604022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220403) 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, 101 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (41613).

2²²⁰⁴⁰⁶ is an apocalyptic number.

220406 is a deficient number, since it is larger than the sum of its proper divisors (112498).

220406 is a wasteful number, since it uses less digits than its factorization.

220406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 220406 is about 469.4741739436. The cubic root of 220406 is about 60.4052200801.

Adding to 220406 its reverse (604022), we get a palindrome (824428).

It can be divided in two parts, 220 and 406, that added together give a palindrome (626).

The spelling of 220406 in words is "two hundred twenty thousand, four hundred six".