20858933 has 4 divisors (see below), whose sum is σ = 20876268. Its totient is φ = 20841600.

The previous prime is 20858927. The next prime is 20858969. The reversal of 20858933 is 33985802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47089 + 20811844 = 217^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 20858933 - 2⁶ = 20858869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20852933) 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, 6716 + ... + 9317.

It is an arithmetic number, because the mean of its divisors is an integer number (5219067).

Almost surely, 2^20858933 is an apocalyptic number.

It is an amenable number.

20858933 is a deficient number, since it is larger than the sum of its proper divisors (17335).

20858933 is a wasteful number, since it uses less digits than its factorization.

20858933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17334.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 20858933 is about 4567.1580879142. The cubic root of 20858933 is about 275.2732622589.

The spelling of 20858933 in words is "twenty million, eight hundred fifty-eight thousand, nine hundred thirty-three".