20816800 has 36 divisors (see below), whose sum is σ = 50820966. Its totient is φ = 8326400.

The previous prime is 20816797. The next prime is 20816801. The reversal of 20816800 is 861802.

It can be written as a sum of positive squares in 3 ways, for example, as 19963024 + 853776 = 4468^2 + 924^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20816801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12211 + ... + 13810.

Almost surely, 2^20816800 is an apocalyptic number.

20816800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20816800 is an abundant number, since it is smaller than the sum of its proper divisors (30004166).

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

20816800 is a wasteful number, since it uses less digits than its factorization.

20816800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26041 (or 26028 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 20816800 is about 4562.5431504809. The cubic root of 20816800 is about 275.0877956591.

The spelling of 20816800 in words is "twenty million, eight hundred sixteen thousand, eight hundred".