20122222 has 4 divisors (see below), whose sum is σ = 30183336. Its totient is φ = 10061110.

The previous prime is 20122213. The next prime is 20122241. The reversal of 20122222 is 22222102.

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

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

20122222 is a modest number, since divided by 2222 gives 2012 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030554 + ... + 5030557.

It is an arithmetic number, because the mean of its divisors is an integer number (7545834).

Almost surely, 2^20122222 is an apocalyptic number.

20122222 is a deficient number, since it is larger than the sum of its proper divisors (10061114).

20122222 is a wasteful number, since it uses less digits than its factorization.

20122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061113.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20122222 is about 4485.7799767710. The cubic root of 20122222 is about 271.9935750357.

Adding to 20122222 its reverse (22222102), we get a palindrome (42344324).

The spelling of 20122222 in words is "twenty million, one hundred twenty-two thousand, two hundred twenty-two".