20722384 has 40 divisors (see below), whose sum is σ = 42497280. Its totient is φ = 9772800.

The previous prime is 20722381. The next prime is 20722397. The reversal of 20722384 is 48322702.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19827 + ... + 20845.

It is an arithmetic number, because the mean of its divisors is an integer number (1062432).

Almost surely, 2^20722384 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 20722384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21248640).

20722384 is an abundant number, since it is smaller than the sum of its proper divisors (21774896).

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

20722384 is a wasteful number, since it uses less digits than its factorization.

20722384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20722384 is about 4552.1845305304. The cubic root of 20722384 is about 274.6712722178.

The spelling of 20722384 in words is "twenty million, seven hundred twenty-two thousand, three hundred eighty-four".