20440560 has 160 divisors (see below), whose sum is σ = 75709440. Its totient is φ = 4468992.

The previous prime is 20440549. The next prime is 20440571. The reversal of 20440560 is 6504402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20440549) and next prime (20440571).

It is a super-2 number, since 2×20440560² = 835632986227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 888709 + ... + 888731.

It is an arithmetic number, because the mean of its divisors is an integer number (473184).

Almost surely, 2^20440560 is an apocalyptic number.

20440560 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 20440560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37854720).

20440560 is an abundant number, since it is smaller than the sum of its proper divisors (55268880).

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

20440560 is an equidigital number, since it uses as much as digits as its factorization.

20440560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 40 counting only the distinct ones).

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

The square root of 20440560 is about 4521.1237541125. The cubic root of 20440560 is about 273.4204098271.

Adding to 20440560 its reverse (6504402), we get a palindrome (26944962).

The spelling of 20440560 in words is "twenty million, four hundred forty thousand, five hundred sixty".