20605755 has 8 divisors (see below), whose sum is σ = 32969232. Its totient is φ = 10989728.

The previous prime is 20605733. The next prime is 20605757. The reversal of 20605755 is 55750602.

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

It is a cyclic number.

It is not a de Polignac number, because 20605755 - 2¹¹ = 20603707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20605757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686844 + ... + 686873.

It is an arithmetic number, because the mean of its divisors is an integer number (4121154).

Almost surely, 2^20605755 is an apocalyptic number.

20605755 is a deficient number, since it is larger than the sum of its proper divisors (12363477).

20605755 is a wasteful number, since it uses less digits than its factorization.

20605755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373725.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 20605755 is about 4539.3562318902. The cubic root of 20605755 is about 274.1550040257.

The spelling of 20605755 in words is "twenty million, six hundred five thousand, seven hundred fifty-five".