20729099 has 2 divisors, whose sum is σ = 20729100. Its totient is φ = 20729098.

The previous prime is 20729087. The next prime is 20729101. The reversal of 20729099 is 99092702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20729099 is a prime.

It is a Sophie Germain prime.

Together with 20729101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20729699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364549 + 10364550.

It is an arithmetic number, because the mean of its divisors is an integer number (10364550).

Almost surely, 2^20729099 is an apocalyptic number.

20729099 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729099 is an equidigital number, since it uses as much as digits as its factorization.

20729099 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 20729099 is about 4552.9220287635. The cubic root of 20729099 is about 274.7009376978.

The spelling of 20729099 in words is "twenty million, seven hundred twenty-nine thousand, ninety-nine".