20887800 has 96 divisors (see below), whose sum is σ = 66900480. Its totient is φ = 5385600.

The previous prime is 20887799. The next prime is 20887807. The reversal of 20887800 is 878802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18039 + ... + 19161.

It is an arithmetic number, because the mean of its divisors is an integer number (696880).

Almost surely, 2^20887800 is an apocalyptic number.

20887800 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 20887800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33450240).

20887800 is an abundant number, since it is smaller than the sum of its proper divisors (46012680).

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

20887800 is a wasteful number, since it uses less digits than its factorization.

20887800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173 (or 1164 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 20887800 is about 4570.3172756385. The cubic root of 20887800 is about 275.4001887001.

The spelling of 20887800 in words is "twenty million, eight hundred eighty-seven thousand, eight hundred".