20523856 has 20 divisors (see below), whose sum is σ = 40036500. Its totient is φ = 10191872.

The previous prime is 20523827. The next prime is 20523859. The reversal of 20523856 is 65832502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 16974400 = 1884^2 + 4120^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523859) 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 in 3 ways as a sum of consecutive naturals, for example, 1921 + ... + 6688.

It is an arithmetic number, because the mean of its divisors is an integer number (2001825).

Almost surely, 2^20523856 is an apocalyptic number.

It is an amenable number.

20523856 is a deficient number, since it is larger than the sum of its proper divisors (19512644).

20523856 is a wasteful number, since it uses less digits than its factorization.

20523856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8766 (or 8760 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 20523856 is about 4530.3262575669. The cubic root of 20523856 is about 273.7913057359.

The spelling of 20523856 in words is "twenty million, five hundred twenty-three thousand, eight hundred fifty-six".