20535856 has 20 divisors (see below), whose sum is σ = 43405704. Its totient is φ = 9334400.

The previous prime is 20535841. The next prime is 20535859. The reversal of 20535856 is 65853502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20535859) 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, 58165 + ... + 58516.

Almost surely, 2^20535856 is an apocalyptic number.

It is an amenable number.

20535856 is an abundant number, since it is smaller than the sum of its proper divisors (22869848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20535856 is a wasteful number, since it uses less digits than its factorization.

20535856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116700 (or 116694 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 20535856 is about 4531.6504719583. The cubic root of 20535856 is about 273.8446559372.

The spelling of 20535856 in words is "twenty million, five hundred thirty-five thousand, eight hundred fifty-six".