20928384 has 96 divisors (see below), whose sum is σ = 61977240. Its totient is φ = 6773760.

The previous prime is 20928373. The next prime is 20928407. The reversal of 20928384 is 48382902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 42379 + ... + 42869.

Almost surely, 2^20928384 is an apocalyptic number.

20928384 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 20928384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30988620).

20928384 is an abundant number, since it is smaller than the sum of its proper divisors (41048856).

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

20928384 is a wasteful number, since it uses less digits than its factorization.

20928384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20928384 is about 4574.7550754111. The cubic root of 20928384 is about 275.5784364551.

It can be divided in two parts, 20928 and 384, that added together give a palindrome (21312).

The spelling of 20928384 in words is "twenty million, nine hundred twenty-eight thousand, three hundred eighty-four".