20616899 has 2 divisors, whose sum is σ = 20616900. Its totient is φ = 20616898.

The previous prime is 20616887. The next prime is 20616923. The reversal of 20616899 is 99861602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20616899 - 2¹² = 20612803 is a prime.

It is not a weakly prime, because it can be changed into another prime (20606899) 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, 10308449 + 10308450.

It is an arithmetic number, because the mean of its divisors is an integer number (10308450).

Almost surely, 2^20616899 is an apocalyptic number.

20616899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20616899 is an equidigital number, since it uses as much as digits as its factorization.

20616899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20616899 is about 4540.5835528046. The cubic root of 20616899 is about 274.2044179356.

The spelling of 20616899 in words is "twenty million, six hundred sixteen thousand, eight hundred ninety-nine".