20871800 has 48 divisors (see below), whose sum is σ = 49178400. Its totient is φ = 8236800.

The previous prime is 20871769. The next prime is 20871853. The reversal of 20871800 is 817802.

It is a self number, because there is not a number n which added to its sum of digits gives 20871800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15140 + ... + 16460.

It is an arithmetic number, because the mean of its divisors is an integer number (1024550).

Almost surely, 2^20871800 is an apocalyptic number.

20871800 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 20871800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24589200).

20871800 is an abundant number, since it is smaller than the sum of its proper divisors (28306600).

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

20871800 is a wasteful number, since it uses less digits than its factorization.

20871800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 20871800 is about 4568.5665147834. The cubic root of 20871800 is about 275.3298521305.

The spelling of 20871800 in words is "twenty million, eight hundred seventy-one thousand, eight hundred".