20549800 has 48 divisors (see below), whose sum is σ = 49087260. Its totient is φ = 7994880.

The previous prime is 20549783. The next prime is 20549801. The reversal of 20549800 is 894502.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8145316 + 12404484 = 2854^2 + 3522^2 .

It is not an unprimeable number, because it can be changed into a prime (20549801) 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, 6012 + ... + 8788.

Almost surely, 2^20549800 is an apocalyptic number.

20549800 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 20549800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24543630).

20549800 is an abundant number, since it is smaller than the sum of its proper divisors (28537460).

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

20549800 is a wasteful number, since it uses less digits than its factorization.

20549800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830 (or 2821 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20549800 is about 4533.1887231837. The cubic root of 20549800 is about 273.9066227713.

It can be divided in two parts, 205 and 49800, that added together give a palindrome (50005).

The spelling of 20549800 in words is "twenty million, five hundred forty-nine thousand, eight hundred".