20440524 has 48 divisors (see below), whose sum is σ = 51656192. Its totient is φ = 6253632.

The previous prime is 20440517. The next prime is 20440549. The reversal of 20440524 is 42504402.

It is a self number, because there is not a number n which added to its sum of digits gives 20440524.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43917 + ... + 44379.

Almost surely, 2^20440524 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 20440524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25828096).

20440524 is an abundant number, since it is smaller than the sum of its proper divisors (31215668).

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

20440524 is a wasteful number, since it uses less digits than its factorization.

20440524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20440524 is about 4521.1197727997. The cubic root of 20440524 is about 273.4202493106.

Adding to 20440524 its reverse (42504402), we get a palindrome (62944926).

The spelling of 20440524 in words is "twenty million, four hundred forty thousand, five hundred twenty-four".