20560261261 has 8 divisors (see below), whose sum is σ = 21981046464. Its totient is φ = 19162960320.

The previous prime is 20560261259. The next prime is 20560261291. The reversal of 20560261261 is 16216206502.

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

It is not a de Polignac number, because 20560261261 - 2¹ = 20560261259 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 (20560261291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5869255 + ... + 5872756.

It is an arithmetic number, because the mean of its divisors is an integer number (2747630808).

Almost surely, 2^20560261261 is an apocalyptic number.

It is an amenable number.

20560261261 is a deficient number, since it is larger than the sum of its proper divisors (1420785203).

20560261261 is a wasteful number, since it uses less digits than its factorization.

20560261261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11742131.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 20560261261 its reverse (16216206502), we get a palindrome (36776467763).

The spelling of 20560261261 in words is "twenty billion, five hundred sixty million, two hundred sixty-one thousand, two hundred sixty-one".