20842656 has 24 divisors (see below), whose sum is σ = 54712224. Its totient is φ = 6947520.

The previous prime is 20842631. The next prime is 20842673. The reversal of 20842656 is 65624802.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108460 + ... + 108651.

It is an arithmetic number, because the mean of its divisors is an integer number (2279676).

Almost surely, 2^20842656 is an apocalyptic number.

It is an amenable number.

20842656 is an abundant number, since it is smaller than the sum of its proper divisors (33869568).

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

20842656 is a wasteful number, since it uses less digits than its factorization.

20842656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217124 (or 217116 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 20842656 is about 4565.3757786189. The cubic root of 20842656 is about 275.2016416434.

The spelling of 20842656 in words is "twenty million, eight hundred forty-two thousand, six hundred fifty-six".