20389233 has 16 divisors (see below), whose sum is σ = 28353600. Its totient is φ = 13016640.

The previous prime is 20389231. The next prime is 20389249. The reversal of 20389233 is 33298302.

It is not a de Polignac number, because 20389233 - 2¹ = 20389231 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20389233.

It is not an unprimeable number, because it can be changed into a prime (20389231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10503 + ... + 12291.

It is an arithmetic number, because the mean of its divisors is an integer number (1772100).

Almost surely, 2^20389233 is an apocalyptic number.

It is an amenable number.

20389233 is a deficient number, since it is larger than the sum of its proper divisors (7964367).

20389233 is a wasteful number, since it uses less digits than its factorization.

20389233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20389233 is about 4515.4438320059. The cubic root of 20389233 is about 273.1913617597.

The spelling of 20389233 in words is "twenty million, three hundred eighty-nine thousand, two hundred thirty-three".