20775855 has 8 divisors (see below), whose sum is σ = 33241392. Its totient is φ = 11080448.

The previous prime is 20775851. The next prime is 20775857. The reversal of 20775855 is 55857702.

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 20775855 - 2² = 20775851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775851) 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, 692514 + ... + 692543.

It is an arithmetic number, because the mean of its divisors is an integer number (4155174).

Almost surely, 2^20775855 is an apocalyptic number.

20775855 is a deficient number, since it is larger than the sum of its proper divisors (12465537).

20775855 is a wasteful number, since it uses less digits than its factorization.

20775855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385065.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 20775855 is about 4558.0538610245. The cubic root of 20775855 is about 274.9073186300.

The spelling of 20775855 in words is "twenty million, seven hundred seventy-five thousand, eight hundred fifty-five".