20768984 has 8 divisors (see below), whose sum is σ = 38941860. Its totient is φ = 10384488.

The previous prime is 20768981. The next prime is 20768987. The reversal of 20768984 is 48986702.

It is an interprime number because it is at equal distance from previous prime (20768981) and next prime (20768987).

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768981) by changing a digit.

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 as a sum of consecutive naturals, namely, 1298054 + ... + 1298069.

Almost surely, 2^20768984 is an apocalyptic number.

It is an amenable number.

20768984 is a deficient number, since it is larger than the sum of its proper divisors (18172876).

20768984 is a wasteful number, since it uses less digits than its factorization.

20768984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596129 (or 2596125 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 20768984 is about 4557.3000778970. The cubic root of 20768984 is about 274.8770094649.

The spelling of 20768984 in words is "twenty million, seven hundred sixty-eight thousand, nine hundred eighty-four".