20172822 has 16 divisors (see below), whose sum is σ = 41007792. Its totient is φ = 6613920.

The previous prime is 20172797. The next prime is 20172827. The reversal of 20172822 is 22827102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20172792 and 20172801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172827) 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 7 ways as a sum of consecutive naturals, for example, 27193 + ... + 27924.

It is an arithmetic number, because the mean of its divisors is an integer number (2562987).

Almost surely, 2^20172822 is an apocalyptic number.

20172822 is an abundant number, since it is smaller than the sum of its proper divisors (20834970).

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

20172822 is a wasteful number, since it uses less digits than its factorization.

20172822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55183.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20172822 is about 4491.4164803545. The cubic root of 20172822 is about 272.2213721910.

Adding to 20172822 its reverse (22827102), we get a palindrome (42999924).

The spelling of 20172822 in words is "twenty million, one hundred seventy-two thousand, eight hundred twenty-two".