20775705 has 16 divisors (see below), whose sum is σ = 33298560. Its totient is φ = 11061248.

The previous prime is 20775701. The next prime is 20775707. The reversal of 20775705 is 50757702.

It is a cyclic number.

It is not a de Polignac number, because 20775705 - 2² = 20775701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20775701) 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 15 ways as a sum of consecutive naturals, for example, 14041 + ... + 15449.

It is an arithmetic number, because the mean of its divisors is an integer number (2081160).

Almost surely, 2^20775705 is an apocalyptic number.

It is an amenable number.

20775705 is a deficient number, since it is larger than the sum of its proper divisors (12522855).

20775705 is a wasteful number, since it uses less digits than its factorization.

20775705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400.

The product of its (nonzero) digits is 17150, while the sum is 33.

The square root of 20775705 is about 4558.0374066039. The cubic root of 20775705 is about 274.9066570255.

The spelling of 20775705 in words is "twenty million, seven hundred seventy-five thousand, seven hundred five".