20856883 has 12 divisors (see below), whose sum is σ = 22097880. Its totient is φ = 19681376.

The previous prime is 20856881. The next prime is 20856907. The reversal of 20856883 is 38865802.

It is not a de Polignac number, because 20856883 - 2¹ = 20856881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20856881) 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 11 ways as a sum of consecutive naturals, for example, 46860 + ... + 47302.

It is an arithmetic number, because the mean of its divisors is an integer number (1841490).

Almost surely, 2^20856883 is an apocalyptic number.

20856883 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20856883 is a deficient number, since it is larger than the sum of its proper divisors (1240997).

20856883 is an equidigital number, since it uses as much as digits as its factorization.

20856883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 20856883 is about 4566.9336539959. The cubic root of 20856883 is about 275.2642440814.

The spelling of 20856883 in words is "twenty million, eight hundred fifty-six thousand, eight hundred eighty-three".