20884872 has 64 divisors (see below), whose sum is σ = 55540800. Its totient is φ = 6531840.

The previous prime is 20884861. The next prime is 20884907. The reversal of 20884872 is 27848802.

It is a self number, because there is not a number n which added to its sum of digits gives 20884872.

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 15 ways as a sum of consecutive naturals, for example, 25347 + ... + 26157.

It is an arithmetic number, because the mean of its divisors is an integer number (867825).

Almost surely, 2^20884872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20884872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27770400).

20884872 is an abundant number, since it is smaller than the sum of its proper divisors (34655928).

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

20884872 is a wasteful number, since it uses less digits than its factorization.

20884872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 20884872 is about 4569.9969365416. The cubic root of 20884872 is about 275.3873197936.

The spelling of 20884872 in words is "twenty million, eight hundred eighty-four thousand, eight hundred seventy-two".