20329951723 has 2 divisors, whose sum is σ = 20329951724. Its totient is φ = 20329951722.

The previous prime is 20329951709. The next prime is 20329951757. The reversal of 20329951723 is 32715992302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20329951723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20329951723.

It is not a weakly prime, because it can be changed into another prime (20329951703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10164975861 + 10164975862.

It is an arithmetic number, because the mean of its divisors is an integer number (10164975862).

Almost surely, 2^20329951723 is an apocalyptic number.

20329951723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20329951723 is an equidigital number, since it uses as much as digits as its factorization.

20329951723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 20329951723 in words is "twenty billion, three hundred twenty-nine million, nine hundred fifty-one thousand, seven hundred twenty-three".