20775838 has 4 divisors (see below), whose sum is σ = 31163760. Its totient is φ = 10387918.

The previous prime is 20775809. The next prime is 20775851. The reversal of 20775838 is 83857702.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20775838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5193958 + ... + 5193961.

It is an arithmetic number, because the mean of its divisors is an integer number (7790940).

Almost surely, 2^20775838 is an apocalyptic number.

20775838 is a deficient number, since it is larger than the sum of its proper divisors (10387922).

20775838 is a wasteful number, since it uses less digits than its factorization.

20775838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10387921.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 20775838 is about 4558.0519961931. The cubic root of 20775838 is about 274.9072436483.

The spelling of 20775838 in words is "twenty million, seven hundred seventy-five thousand, eight hundred thirty-eight".