20079929 has 2 divisors, whose sum is σ = 20079930. Its totient is φ = 20079928.

The previous prime is 20079923. The next prime is 20079931. The reversal of 20079929 is 92997002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 7689529 = 3520^2 + 2773^2 .

It is a cyclic number.

It is not a de Polignac number, because 20079929 - 2⁸ = 20079673 is a prime.

It is a Sophie Germain prime.

Together with 20079931, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20079892 and 20079901.

It is not a weakly prime, because it can be changed into another prime (20079923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10039964 + 10039965.

It is an arithmetic number, because the mean of its divisors is an integer number (10039965).

Almost surely, 2^20079929 is an apocalyptic number.

It is an amenable number.

20079929 is a deficient number, since it is larger than the sum of its proper divisors (1).

20079929 is an equidigital number, since it uses as much as digits as its factorization.

20079929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 20079929 is about 4481.0633782619. The cubic root of 20079929 is about 271.8028821620.

The spelling of 20079929 in words is "twenty million, seventy-nine thousand, nine hundred twenty-nine".