20775856 has 10 divisors (see below), whose sum is σ = 40253252. Its totient is φ = 10387920.

The previous prime is 20775851. The next prime is 20775857. The reversal of 20775856 is 65857702.

It is not an unprimeable number, because it can be changed into a prime (20775851) 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 as a sum of consecutive naturals, namely, 649230 + ... + 649261.

Almost surely, 2^20775856 is an apocalyptic number.

It is an amenable number.

20775856 is a deficient number, since it is larger than the sum of its proper divisors (19477396).

20775856 is a wasteful number, since it uses less digits than its factorization.

20775856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298499 (or 1298493 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 20775856 is about 4558.0539707204. The cubic root of 20775856 is about 274.9073230407.

The spelling of 20775856 in words is "twenty million, seven hundred seventy-five thousand, eight hundred fifty-six".