20005122 has 16 divisors (see below), whose sum is σ = 40059360. Its totient is φ = 6660192.

The previous prime is 20005093. The next prime is 20005129. The reversal of 20005122 is 22150002.

It is a junction number, because it is equal to n+sod(n) for n = 20005098 and 20005107.

It is not an unprimeable number, because it can be changed into a prime (20005129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5254 + ... + 8222.

It is an arithmetic number, because the mean of its divisors is an integer number (2503710).

Almost surely, 2^20005122 is an apocalyptic number.

20005122 is an abundant number, since it is smaller than the sum of its proper divisors (20054238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20005122 is a wasteful number, since it uses less digits than its factorization.

20005122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4097.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20005122 is about 4472.7085753489. The cubic root of 20005122 is about 271.4649317600.

Adding to 20005122 its reverse (22150002), we get a palindrome (42155124).

The spelling of 20005122 in words is "twenty million, five thousand, one hundred twenty-two".