20730832 has 20 divisors (see below), whose sum is σ = 40718500. Its totient is φ = 10222848.

The previous prime is 20730823. The next prime is 20730839. The reversal of 20730832 is 23803702.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5645376 + 15085456 = 2376^2 + 3884^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20730797 and 20730806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730839) 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, 7707 + ... + 10042.

It is an arithmetic number, because the mean of its divisors is an integer number (2035925).

Almost surely, 2^20730832 is an apocalyptic number.

It is an amenable number.

20730832 is a deficient number, since it is larger than the sum of its proper divisors (19987668).

20730832 is a wasteful number, since it uses less digits than its factorization.

20730832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830 (or 17824 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20730832 is about 4553.1123421238. The cubic root of 20730832 is about 274.7085926930.

The spelling of 20730832 in words is "twenty million, seven hundred thirty thousand, eight hundred thirty-two".