20801856 has 28 divisors (see below), whose sum is σ = 55038752. Its totient is φ = 6933888.

The previous prime is 20801849. The next prime is 20801873. The reversal of 20801856 is 65810802.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 53980 + ... + 54363.

Almost surely, 2^20801856 is an apocalyptic number.

It is an amenable number.

20801856 is an abundant number, since it is smaller than the sum of its proper divisors (34236896).

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

20801856 is a wasteful number, since it uses less digits than its factorization.

20801856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108358 (or 108348 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 20801856 is about 4560.9051733181. The cubic root of 20801856 is about 275.0219530684.

The spelling of 20801856 in words is "twenty million, eight hundred one thousand, eight hundred fifty-six".