20704499 has 2 divisors, whose sum is σ = 20704500. Its totient is φ = 20704498.

The previous prime is 20704469. The next prime is 20704501. The reversal of 20704499 is 99440702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20704499 is a prime.

Together with 20704501, 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 (20704459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352249 + 10352250.

It is an arithmetic number, because the mean of its divisors is an integer number (10352250).

Almost surely, 2^20704499 is an apocalyptic number.

20704499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704499 is an equidigital number, since it uses as much as digits as its factorization.

20704499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20704499 is about 4550.2196650272. The cubic root of 20704499 is about 274.5922287115.

The spelling of 20704499 in words is "twenty million, seven hundred four thousand, four hundred ninety-nine".