20729699 has 2 divisors, whose sum is σ = 20729700. Its totient is φ = 20729698.

The previous prime is 20729633. The next prime is 20729701. The reversal of 20729699 is 99692702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20729699 - 2¹² = 20725603 is a prime.

Together with 20729701, 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 (20729629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10364849 + 10364850.

It is an arithmetic number, because the mean of its divisors is an integer number (10364850).

Almost surely, 2^20729699 is an apocalyptic number.

20729699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20729699 is an equidigital number, since it uses as much as digits as its factorization.

20729699 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 20729699 is about 4552.9879200367. The cubic root of 20729699 is about 274.7035880618.

The spelling of 20729699 in words is "twenty million, seven hundred twenty-nine thousand, six hundred ninety-nine".