20171222 has 8 divisors (see below), whose sum is σ = 30276696. Its totient is φ = 10078992.

The previous prime is 20171219. The next prime is 20171233. The reversal of 20171222 is 22217102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20171222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2633 + ... + 6875.

It is an arithmetic number, because the mean of its divisors is an integer number (3784587).

Almost surely, 2^20171222 is an apocalyptic number.

20171222 is a deficient number, since it is larger than the sum of its proper divisors (10105474).

20171222 is a wasteful number, since it uses less digits than its factorization.

20171222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 20171222 is about 4491.2383592947. The cubic root of 20171222 is about 272.2141749545.

Adding to 20171222 its reverse (22217102), we get a palindrome (42388324).

The spelling of 20171222 in words is "twenty million, one hundred seventy-one thousand, two hundred twenty-two".