20973321 has 12 divisors (see below), whose sum is σ = 31889520. Its totient is φ = 13246200.

The previous prime is 20973317. The next prime is 20973331. The reversal of 20973321 is 12337902.

It is not a de Polignac number, because 20973321 - 2² = 20973317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20973301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61155 + ... + 61496.

It is an arithmetic number, because the mean of its divisors is an integer number (2657460).

Almost surely, 2^20973321 is an apocalyptic number.

It is an amenable number.

20973321 is a deficient number, since it is larger than the sum of its proper divisors (10916199).

20973321 is a wasteful number, since it uses less digits than its factorization.

20973321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122676 (or 122673 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20973321 is about 4579.6638522931. The cubic root of 20973321 is about 275.7755342568.

The spelling of 20973321 in words is "twenty million, nine hundred seventy-three thousand, three hundred twenty-one".