20805373 has 2 divisors, whose sum is σ = 20805374. Its totient is φ = 20805372.

The previous prime is 20805353. The next prime is 20805377. The reversal of 20805373 is 37350802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14915044 + 5890329 = 3862^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 20805373 - 2⁵ = 20805341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20805377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10402686 + 10402687.

It is an arithmetic number, because the mean of its divisors is an integer number (10402687).

Almost surely, 2^20805373 is an apocalyptic number.

It is an amenable number.

20805373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20805373 is an equidigital number, since it uses as much as digits as its factorization.

20805373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20805373 is about 4561.2907164530. The cubic root of 20805373 is about 275.0374516486.

The spelling of 20805373 in words is "twenty million, eight hundred five thousand, three hundred seventy-three".