20727723917 has 2 divisors, whose sum is σ = 20727723918. Its totient is φ = 20727723916.

The previous prime is 20727723839. The next prime is 20727723923. The reversal of 20727723917 is 71932772702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20727648841 + 75076 = 143971^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727723917 - 2¹⁸ = 20727461773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20727723517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363861958 + 10363861959.

It is an arithmetic number, because the mean of its divisors is an integer number (10363861959).

Almost surely, 2^20727723917 is an apocalyptic number.

It is an amenable number.

20727723917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727723917 is an equidigital number, since it uses as much as digits as its factorization.

20727723917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518616, while the sum is 47.

The spelling of 20727723917 in words is "twenty billion, seven hundred twenty-seven million, seven hundred twenty-three thousand, nine hundred seventeen".