20955199 has 2 divisors, whose sum is σ = 20955200. Its totient is φ = 20955198.

The previous prime is 20955173. The next prime is 20955227. The reversal of 20955199 is 99155902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20955199 - 2⁵ = 20955167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20955799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477599 + 10477600.

It is an arithmetic number, because the mean of its divisors is an integer number (10477600).

Almost surely, 2^20955199 is an apocalyptic number.

20955199 is a deficient number, since it is larger than the sum of its proper divisors (1).

20955199 is an equidigital number, since it uses as much as digits as its factorization.

20955199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 40.

The square root of 20955199 is about 4577.6848952282. The cubic root of 20955199 is about 275.6960834104.

The spelling of 20955199 in words is "twenty million, nine hundred fifty-five thousand, one hundred ninety-nine".