20855933 has 4 divisors (see below), whose sum is σ = 23835360. Its totient is φ = 17876508.

The previous prime is 20855929. The next prime is 20855941. The reversal of 20855933 is 33955802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33955802 = 2 ⋅16977901.

It is a cyclic number.

It is not a de Polignac number, because 20855933 - 2² = 20855929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20855893 and 20855902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489703 + ... + 1489716.

It is an arithmetic number, because the mean of its divisors is an integer number (5958840).

Almost surely, 2^20855933 is an apocalyptic number.

It is an amenable number.

20855933 is a deficient number, since it is larger than the sum of its proper divisors (2979427).

20855933 is an equidigital number, since it uses as much as digits as its factorization.

20855933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979426.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20855933 is about 4566.8296442937. The cubic root of 20855933 is about 275.2600647257.

The spelling of 20855933 in words is "twenty million, eight hundred fifty-five thousand, nine hundred thirty-three".