20560405 has 8 divisors (see below), whose sum is σ = 24713784. Its totient is φ = 16420800.

The previous prime is 20560403. The next prime is 20560427. The reversal of 20560405 is 50406502.

It can be written as a sum of positive squares in 4 ways, for example, as 695556 + 19864849 = 834^2 + 4457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20560405 - 2¹ = 20560403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560403) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 195 + ... + 6415.

It is an arithmetic number, because the mean of its divisors is an integer number (3089223).

Almost surely, 2^20560405 is an apocalyptic number.

It is an amenable number.

20560405 is a deficient number, since it is larger than the sum of its proper divisors (4153379).

20560405 is an equidigital number, since it uses as much as digits as its factorization.

20560405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20560405 is about 4534.3582787424. The cubic root of 20560405 is about 273.9537323976.

Adding to 20560405 its reverse (50406502), we get a palindrome (70966907).

The spelling of 20560405 in words is "twenty million, five hundred sixty thousand, four hundred five".