20945723 has 2 divisors, whose sum is σ = 20945724. Its totient is φ = 20945722.

The previous prime is 20945713. The next prime is 20945731. The reversal of 20945723 is 32754902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20945723 - 2⁴ = 20945707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20945723.

It is not a weakly prime, because it can be changed into another prime (20945713) 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, 10472861 + 10472862.

It is an arithmetic number, because the mean of its divisors is an integer number (10472862).

Almost surely, 2^20945723 is an apocalyptic number.

20945723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945723 is an equidigital number, since it uses as much as digits as its factorization.

20945723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20945723 is about 4576.6497571914. The cubic root of 20945723 is about 275.6545202963.

The spelling of 20945723 in words is "twenty million, nine hundred forty-five thousand, seven hundred twenty-three".