20722144 has 24 divisors (see below), whose sum is σ = 40981248. Its totient is φ = 10314240.

The previous prime is 20722129. The next prime is 20722171. The reversal of 20722144 is 44122702.

It is a happy number.

It is a congruent 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 in 3 ways as a sum of consecutive naturals, for example, 6369 + ... + 9055.

It is an arithmetic number, because the mean of its divisors is an integer number (1707552).

Almost surely, 2^20722144 is an apocalyptic number.

It is an amenable number.

20722144 is a deficient number, since it is larger than the sum of its proper divisors (20259104).

20722144 is a wasteful number, since it uses less digits than its factorization.

20722144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938 (or 2930 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20722144 is about 4552.1581694840. The cubic root of 20722144 is about 274.6702118289.

Adding to 20722144 its reverse (44122702), we get a palindrome (64844846).

The spelling of 20722144 in words is "twenty million, seven hundred twenty-two thousand, one hundred forty-four".