20976384 has 144 divisors (see below), whose sum is σ = 65931264. Its totient is φ = 5836800.

The previous prime is 20976377. The next prime is 20976407. The reversal of 20976384 is 48367902.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109729 + ... + 109919.

It is an arithmetic number, because the mean of its divisors is an integer number (457856).

Almost surely, 2^20976384 is an apocalyptic number.

20976384 is a gapful number since it is divisible by the number (24) 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 20976384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32965632).

20976384 is an abundant number, since it is smaller than the sum of its proper divisors (44954880).

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

20976384 is a wasteful number, since it uses less digits than its factorization.

20976384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20976384 is about 4579.9982532748. The cubic root of 20976384 is about 275.7889586026.

The spelling of 20976384 in words is "twenty million, nine hundred seventy-six thousand, three hundred eighty-four".