20965723 has 2 divisors, whose sum is σ = 20965724. Its totient is φ = 20965722.

The previous prime is 20965669. The next prime is 20965727. The reversal of 20965723 is 32756902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20965723 - 2¹⁷ = 20834651 is a prime.

It is not a weakly prime, because it can be changed into another prime (20965727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10482861 + 10482862.

It is an arithmetic number, because the mean of its divisors is an integer number (10482862).

Almost surely, 2^20965723 is an apocalyptic number.

20965723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20965723 is an equidigital number, since it uses as much as digits as its factorization.

20965723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 20965723 is about 4578.8342402843. The cubic root of 20965723 is about 275.7422285222.

The spelling of 20965723 in words is "twenty million, nine hundred sixty-five thousand, seven hundred twenty-three".