20995305 has 8 divisors (see below), whose sum is σ = 33592512. Its totient is φ = 11197488.

The previous prime is 20995301. The next prime is 20995307. The reversal of 20995305 is 50359902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20995305 - 2² = 20995301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20995301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699829 + ... + 699858.

It is an arithmetic number, because the mean of its divisors is an integer number (4199064).

Almost surely, 2^20995305 is an apocalyptic number.

It is an amenable number.

20995305 is a deficient number, since it is larger than the sum of its proper divisors (12597207).

20995305 is a wasteful number, since it uses less digits than its factorization.

20995305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399695.

The product of its (nonzero) digits is 12150, while the sum is 33.

The square root of 20995305 is about 4582.0633998233. The cubic root of 20995305 is about 275.8718555517.

The spelling of 20995305 in words is "twenty million, nine hundred ninety-five thousand, three hundred five".