20955899 has 2 divisors, whose sum is σ = 20955900. Its totient is φ = 20955898.

The previous prime is 20955877. The next prime is 20955911. The reversal of 20955899 is 99855902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20955899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20955839) 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, 10477949 + 10477950.

It is an arithmetic number, because the mean of its divisors is an integer number (10477950).

Almost surely, 2^20955899 is an apocalyptic number.

20955899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955899 is an equidigital number, since it uses as much as digits as its factorization.

20955899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 47.

The square root of 20955899 is about 4577.7613524517. The cubic root of 20955899 is about 275.6991532152.

The spelling of 20955899 in words is "twenty million, nine hundred fifty-five thousand, eight hundred ninety-nine".