20843856 has 60 divisors (see below), whose sum is σ = 63641760. Its totient is φ = 6315840.

The previous prime is 20843843. The next prime is 20843861. The reversal of 20843856 is 65834802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20843856.

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 11 ways as a sum of consecutive naturals, for example, 4996 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (1060696).

Almost surely, 2^20843856 is an apocalyptic number.

It is an amenable number.

20843856 is an abundant number, since it is smaller than the sum of its proper divisors (42797904).

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

20843856 is a wasteful number, since it uses less digits than its factorization.

20843856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13184 (or 13175 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 20843856 is about 4565.5072007390. The cubic root of 20843856 is about 275.2069230501.

The spelling of 20843856 in words is "twenty million, eight hundred forty-three thousand, eight hundred fifty-six".