20984688 has 60 divisors (see below), whose sum is σ = 60111480. Its totient is φ = 6830208.

The previous prime is 20984633. The next prime is 20984729. The reversal of 20984688 is 88648902.

It is a happy number.

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, 4498 + ... + 7886.

It is an arithmetic number, because the mean of its divisors is an integer number (1001858).

Almost surely, 2^20984688 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 20984688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30055740).

20984688 is an abundant number, since it is smaller than the sum of its proper divisors (39126792).

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

20984688 is a wasteful number, since it uses less digits than its factorization.

20984688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3446 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 20984688 is about 4580.9047141367. The cubic root of 20984688 is about 275.8253463387.

It can be divided in two parts, 2098 and 4688, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 20984688 in words is "twenty million, nine hundred eighty-four thousand, six hundred eighty-eight".