20973793 has 2 divisors, whose sum is σ = 20973794. Its totient is φ = 20973792.

The previous prime is 20973791. The next prime is 20973803. The reversal of 20973793 is 39737902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17918289 + 3055504 = 4233^2 + 1748^2 .

It is a cyclic number.

It is not a de Polignac number, because 20973793 - 2¹ = 20973791 is a prime.

Together with 20973791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20973791) 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 as a sum of consecutive naturals, namely, 10486896 + 10486897.

It is an arithmetic number, because the mean of its divisors is an integer number (10486897).

Almost surely, 2^20973793 is an apocalyptic number.

It is an amenable number.

20973793 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973793 is an equidigital number, since it uses as much as digits as its factorization.

20973793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 20973793 is about 4579.7153841696. The cubic root of 20973793 is about 275.7776029973. Note that the first 3 decimals are identical.

The spelling of 20973793 in words is "twenty million, nine hundred seventy-three thousand, seven hundred ninety-three".