20806828 has 24 divisors (see below), whose sum is σ = 42957824. Its totient is φ = 8629200.

The previous prime is 20806823. The next prime is 20806829. The reversal of 20806828 is 82860802.

It is a happy number.

It is a super-3 number, since 3×20806828³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20806793 and 20806802.

It is not an unprimeable number, because it can be changed into a prime (20806823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11118 + ... + 12853.

Almost surely, 2^20806828 is an apocalyptic number.

20806828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20806828 is an abundant number, since it is smaller than the sum of its proper divisors (22150996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20806828 is a wasteful number, since it uses less digits than its factorization.

20806828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24013 (or 24011 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 20806828 is about 4561.4502079931. The cubic root of 20806828 is about 275.0438629759.

The spelling of 20806828 in words is "twenty million, eight hundred six thousand, eight hundred twenty-eight".