20487800 has 48 divisors (see below), whose sum is σ = 48211200. Its totient is φ = 8096000.

The previous prime is 20487793. The next prime is 20487821. The reversal of 20487800 is 878402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17225 + ... + 18375.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^20487800 is an apocalyptic number.

20487800 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 20487800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24105600).

20487800 is an abundant number, since it is smaller than the sum of its proper divisors (27723400).

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

20487800 is a wasteful number, since it uses less digits than its factorization.

20487800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20487800 is about 4526.3451039442. The cubic root of 20487800 is about 273.6308809460.

The spelling of 20487800 in words is "twenty million, four hundred eighty-seven thousand, eight hundred".