20855936 has 16 divisors (see below), whose sum is σ = 41549190. Its totient is φ = 10427904.

The previous prime is 20855929. The next prime is 20855941. The reversal of 20855936 is 63955802.

It can be written as a sum of positive squares in only one way, i.e., 19855936 + 1000000 = 4456^2 + 1000^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a self number, because there is not a number n which added to its sum of digits gives 20855936.

It is an unprimeable number.

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, 81341 + ... + 81596.

Almost surely, 2^20855936 is an apocalyptic number.

It is an amenable number.

20855936 is a deficient number, since it is larger than the sum of its proper divisors (20693254).

20855936 is an equidigital number, since it uses as much as digits as its factorization.

20855936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162951 (or 162939 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 20855936 is about 4566.8299727491. The cubic root of 20855936 is about 275.2600779239.

The spelling of 20855936 in words is "twenty million, eight hundred fifty-five thousand, nine hundred thirty-six".