20042122 has 4 divisors (see below), whose sum is σ = 30063186. Its totient is φ = 10021060.

The previous prime is 20042117. The next prime is 20042173. The reversal of 20042122 is 22124002.

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

It can be written as a sum of positive squares in only one way, i.e., 18740241 + 1301881 = 4329^2 + 1141^2 .

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.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010529 + ... + 5010532.

Almost surely, 2^20042122 is an apocalyptic number.

20042122 is a deficient number, since it is larger than the sum of its proper divisors (10021064).

20042122 is a wasteful number, since it uses less digits than its factorization.

20042122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10021063.

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

The square root of 20042122 is about 4476.8428607669. The cubic root of 20042122 is about 271.6321892003.

Adding to 20042122 its reverse (22124002), we get a palindrome (42166124).

It can be divided in two parts, 20042 and 122, that added together give a square (20164 = 142²).

The spelling of 20042122 in words is "twenty million, forty-two thousand, one hundred twenty-two".