20560440 has 64 divisors (see below), whose sum is σ = 63682560. Its totient is φ = 5304960.

The previous prime is 20560427. The next prime is 20560487. The reversal of 20560440 is 4406502.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 957 + ... + 6483.

It is an arithmetic number, because the mean of its divisors is an integer number (995040).

Almost surely, 2^20560440 is an apocalyptic number.

20560440 is a gapful number since it is divisible by the number (20) 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 20560440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31841280).

20560440 is an abundant number, since it is smaller than the sum of its proper divisors (43122120).

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

20560440 is a wasteful number, since it uses less digits than its factorization.

20560440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5572 (or 5568 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20560440 is about 4534.3621381623. The cubic root of 20560440 is about 273.9538878481.

Adding to 20560440 its reverse (4406502), we get a palindrome (24966942).

The spelling of 20560440 in words is "twenty million, five hundred sixty thousand, four hundred forty".