20648699 has 2 divisors, whose sum is σ = 20648700. Its totient is φ = 20648698.

The previous prime is 20648647. The next prime is 20648711. The reversal of 20648699 is 99684602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20648699 - 2⁸ = 20648443 is a prime.

It is not a weakly prime, because it can be changed into another prime (20648599) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324349 + 10324350.

It is an arithmetic number, because the mean of its divisors is an integer number (10324350).

Almost surely, 2^20648699 is an apocalyptic number.

20648699 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648699 is an equidigital number, since it uses as much as digits as its factorization.

20648699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 20648699 is about 4544.0839560906. The cubic root of 20648699 is about 274.3453253399.

The spelling of 20648699 in words is "twenty million, six hundred forty-eight thousand, six hundred ninety-nine".