20644822 has 16 divisors (see below), whose sum is σ = 34873344. Its totient is φ = 9081000.

The previous prime is 20644807. The next prime is 20644831. The reversal of 20644822 is 22844602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14454 + ... + 15817.

It is an arithmetic number, because the mean of its divisors is an integer number (2179584).

Almost surely, 2^20644822 is an apocalyptic number.

20644822 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20644822 is a deficient number, since it is larger than the sum of its proper divisors (14228522).

20644822 is a wasteful number, since it uses less digits than its factorization.

20644822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30315.

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 20644822 is about 4543.6573374320. The cubic root of 20644822 is about 274.3281539045.

It can be divided in two parts, 2064 and 4822, that added together give a palindrome (6886).

The spelling of 20644822 in words is "twenty million, six hundred forty-four thousand, eight hundred twenty-two".