20518422 has 24 divisors (see below), whose sum is σ = 43596456. Its totient is φ = 6436608.

The previous prime is 20518417. The next prime is 20518429. The reversal of 20518422 is 22481502.

It is a junction number, because it is equal to n+sod(n) for n = 20518392 and 20518401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20518429) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 4183 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (1816519).

Almost surely, 2^20518422 is an apocalyptic number.

20518422 is an abundant number, since it is smaller than the sum of its proper divisors (23078034).

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

20518422 is a wasteful number, since it uses less digits than its factorization.

20518422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11872 (or 11855 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 20518422 is about 4529.7264818088. The cubic root of 20518422 is about 273.7671401457.

Adding to 20518422 its reverse (22481502), we get a palindrome (42999924).

The spelling of 20518422 in words is "twenty million, five hundred eighteen thousand, four hundred twenty-two".