20597699 has 2 divisors, whose sum is σ = 20597700. Its totient is φ = 20597698.

The previous prime is 20597669. The next prime is 20597701. The reversal of 20597699 is 99679502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20597699 - 2¹⁶ = 20532163 is a prime.

Together with 20597701, 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 (20597639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10298849 + 10298850.

It is an arithmetic number, because the mean of its divisors is an integer number (10298850).

Almost surely, 2^20597699 is an apocalyptic number.

20597699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20597699 is an equidigital number, since it uses as much as digits as its factorization.

20597699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 20597699 is about 4538.4687946487. The cubic root of 20597699 is about 274.1192716037.

The spelling of 20597699 in words is "twenty million, five hundred ninety-seven thousand, six hundred ninety-nine".