20560261 has 8 divisors (see below), whose sum is σ = 22010400. Its totient is φ = 19146960.

The previous prime is 20560247. The next prime is 20560273. The reversal of 20560261 is 16206502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20560261 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 (20560061) 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, 8050 + ... + 10291.

It is an arithmetic number, because the mean of its divisors is an integer number (2751300).

Almost surely, 2^20560261 is an apocalyptic number.

It is an amenable number.

20560261 is a deficient number, since it is larger than the sum of its proper divisors (1450139).

20560261 is a wasteful number, since it uses less digits than its factorization.

20560261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18419.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20560261 is about 4534.3423999517. The cubic root of 20560261 is about 273.9530928280.

Adding to 20560261 its reverse (16206502), we get a palindrome (36766763).

The spelling of 20560261 in words is "twenty million, five hundred sixty thousand, two hundred sixty-one".