20869984 has 24 divisors (see below), whose sum is σ = 42092568. Its totient is φ = 10179840.

The previous prime is 20869967. The next prime is 20869987. The reversal of 20869984 is 48996802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869987) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6642 + ... + 9265.

It is an arithmetic number, because the mean of its divisors is an integer number (1753857).

Almost surely, 2^20869984 is an apocalyptic number.

It is an amenable number.

20869984 is an abundant number, since it is smaller than the sum of its proper divisors (21222584).

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

20869984 is a wasteful number, since it uses less digits than its factorization.

20869984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15958 (or 15950 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 20869984 is about 4568.3677610280. The cubic root of 20869984 is about 275.3218666587.

The spelling of 20869984 in words is "twenty million, eight hundred sixty-nine thousand, nine hundred eighty-four".