20684828 has 12 divisors (see below), whose sum is σ = 37081632. Its totient is φ = 10090080.

The previous prime is 20684827. The next prime is 20684837. The reversal of 20684828 is 82848602.

It is a junction number, because it is equal to n+sod(n) for n = 20684791 and 20684800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62900 + ... + 63227.

It is an arithmetic number, because the mean of its divisors is an integer number (3090136).

Almost surely, 2^20684828 is an apocalyptic number.

It is an amenable number.

20684828 is a deficient number, since it is larger than the sum of its proper divisors (16396804).

20684828 is a wasteful number, since it uses less digits than its factorization.

20684828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126172 (or 126170 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 20684828 is about 4548.0576073748. The cubic root of 20684828 is about 274.5052393208.

It can be divided in two parts, 20684 and 828, that added together give a palindrome (21512).

The spelling of 20684828 in words is "twenty million, six hundred eighty-four thousand, eight hundred twenty-eight".