20859596261 has 16 divisors (see below), whose sum is σ = 24458198400. Its totient is φ = 17421024768.

The previous prime is 20859596257. The next prime is 20859596321. The reversal of 20859596261 is 16269595802.

It is not a de Polignac number, because 20859596261 - 2² = 20859596257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20859596161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176816 + ... + 270153.

It is an arithmetic number, because the mean of its divisors is an integer number (1528637400).

Almost surely, 2^20859596261 is an apocalyptic number.

It is an amenable number.

20859596261 is a deficient number, since it is larger than the sum of its proper divisors (3598602139).

20859596261 is a wasteful number, since it uses less digits than its factorization.

20859596261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447148.

The product of its (nonzero) digits is 2332800, while the sum is 53.

The spelling of 20859596261 in words is "twenty billion, eight hundred fifty-nine million, five hundred ninety-six thousand, two hundred sixty-one".