20180222 has 4 divisors (see below), whose sum is σ = 30270336. Its totient is φ = 10090110.

The previous prime is 20180221. The next prime is 20180231. The reversal of 20180222 is 22208102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20180222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045054 + ... + 5045057.

It is an arithmetic number, because the mean of its divisors is an integer number (7567584).

Almost surely, 2^20180222 is an apocalyptic number.

20180222 is a deficient number, since it is larger than the sum of its proper divisors (10090114).

20180222 is a wasteful number, since it uses less digits than its factorization.

20180222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090113.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 20180222 is about 4492.2401983865. The cubic root of 20180222 is about 272.2546544604.

Adding to 20180222 its reverse (22208102), we get a palindrome (42388324).

It can be divided in two parts, 20180 and 222, that added together give a palindrome (20402).

The spelling of 20180222 in words is "twenty million, one hundred eighty thousand, two hundred twenty-two".