20732973 has 16 divisors (see below), whose sum is σ = 28129920. Its totient is φ = 13581504.

The previous prime is 20732947. The next prime is 20732983. The reversal of 20732973 is 37923702.

It is not a de Polignac number, because 20732973 - 2⁶ = 20732909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732983) 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 in 15 ways as a sum of consecutive naturals, for example, 70615 + ... + 70907.

It is an arithmetic number, because the mean of its divisors is an integer number (1758120).

Almost surely, 2^20732973 is an apocalyptic number.

It is an amenable number.

20732973 is a deficient number, since it is larger than the sum of its proper divisors (7396947).

20732973 is a wasteful number, since it uses less digits than its factorization.

20732973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 15876, while the sum is 33.

The square root of 20732973 is about 4553.3474499537. The cubic root of 20732973 is about 274.7180493138.

The spelling of 20732973 in words is "twenty million, seven hundred thirty-two thousand, nine hundred seventy-three".