20440384 has 28 divisors (see below), whose sum is σ = 40743124. Its totient is φ = 10174464.

The previous prime is 20440379. The next prime is 20440397. The reversal of 20440384 is 48304402.

It can be written as a sum of positive squares in 2 ways, for example, as 9734400 + 10705984 = 3120^2 + 3272^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17152 + ... + 18304.

Almost surely, 2^20440384 is an apocalyptic number.

It is an amenable number.

20440384 is a deficient number, since it is larger than the sum of its proper divisors (20302740).

20440384 is a wasteful number, since it uses less digits than its factorization.

20440384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20440384 is about 4521.1042898832. The cubic root of 20440384 is about 273.4196250781.

Adding to 20440384 its reverse (48304402), we get a palindrome (68744786).

The spelling of 20440384 in words is "twenty million, four hundred forty thousand, three hundred eighty-four".