20802800 has 60 divisors (see below), whose sum is σ = 50487096. Its totient is φ = 8236800.

The previous prime is 20802779. The next prime is 20802809. The reversal of 20802800 is 820802.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52202 + ... + 52598.

Almost surely, 2^20802800 is an apocalyptic number.

20802800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20802800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25243548).

20802800 is an abundant number, since it is smaller than the sum of its proper divisors (29684296).

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

20802800 is a wasteful number, since it uses less digits than its factorization.

20802800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 20802800 is about 4561.0086603733. The cubic root of 20802800 is about 275.0261132228.

The spelling of 20802800 in words is "twenty million, eight hundred two thousand, eight hundred".