20021984 has 24 divisors (see below), whose sum is σ = 39564000. Its totient is φ = 9974016.

The previous prime is 20021951. The next prime is 20021999. The reversal of 20021984 is 48912002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9017 + ... + 11015.

It is an arithmetic number, because the mean of its divisors is an integer number (1648500).

Almost surely, 2^20021984 is an apocalyptic number.

It is an amenable number.

20021984 is a deficient number, since it is larger than the sum of its proper divisors (19542016).

20021984 is a wasteful number, since it uses less digits than its factorization.

20021984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2314 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 20021984 is about 4474.5931658644. The cubic root of 20021984 is about 271.5411815024.

Adding to 20021984 its reverse (48912002), we get a palindrome (68933986).

The spelling of 20021984 in words is "twenty million, twenty-one thousand, nine hundred eighty-four".