20816828 has 6 divisors (see below), whose sum is σ = 36429456. Its totient is φ = 10408412.

The previous prime is 20816821. The next prime is 20816839. The reversal of 20816828 is 82861802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602100 + ... + 2602107.

It is an arithmetic number, because the mean of its divisors is an integer number (6071576).

Almost surely, 2^20816828 is an apocalyptic number.

It is an amenable number.

20816828 is a deficient number, since it is larger than the sum of its proper divisors (15612628).

20816828 is a wasteful number, since it uses less digits than its factorization.

20816828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5204211 (or 5204209 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 20816828 is about 4562.5462189440. The cubic root of 20816828 is about 275.0879189963.

The spelling of 20816828 in words is "twenty million, eight hundred sixteen thousand, eight hundred twenty-eight".