20117723 has 2 divisors, whose sum is σ = 20117724. Its totient is φ = 20117722.

The previous prime is 20117719. The next prime is 20117731. The reversal of 20117723 is 32771102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20117723 - 2² = 20117719 is a prime.

It is not a weakly prime, because it can be changed into another prime (20117023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058861 + 10058862.

It is an arithmetic number, because the mean of its divisors is an integer number (10058862).

Almost surely, 2^20117723 is an apocalyptic number.

20117723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117723 is an equidigital number, since it uses as much as digits as its factorization.

20117723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 20117723 is about 4485.2784751897. The cubic root of 20117723 is about 271.9733024186.

Adding to 20117723 its reverse (32771102), we get a palindrome (52888825).

The spelling of 20117723 in words is "twenty million, one hundred seventeen thousand, seven hundred twenty-three".