20905232 has 20 divisors (see below), whose sum is σ = 40885776. Its totient is φ = 10354080.

The previous prime is 20905207. The next prime is 20905237. The reversal of 20905232 is 23250902.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20905198 and 20905207.

It is not an unprimeable number, because it can be changed into a prime (20905237) 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, 4394 + ... + 7817.

Almost surely, 2^20905232 is an apocalyptic number.

It is an amenable number.

20905232 is a deficient number, since it is larger than the sum of its proper divisors (19980544).

20905232 is a wasteful number, since it uses less digits than its factorization.

20905232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12326 (or 12320 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20905232 is about 4572.2239665178. The cubic root of 20905232 is about 275.4767795204.

The spelling of 20905232 in words is "twenty million, nine hundred five thousand, two hundred thirty-two".