20855877261 has 8 divisors (see below), whose sum is σ = 27811230720. Its totient is φ = 13902220992.

The previous prime is 20855877241. The next prime is 20855877311. The reversal of 20855877261 is 16277855802.

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

It is not a de Polignac number, because 20855877261 - 2²¹ = 20853780109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855877241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395341 + ... + 444978.

It is an arithmetic number, because the mean of its divisors is an integer number (3476403840).

Almost surely, 2^20855877261 is an apocalyptic number.

It is an amenable number.

20855877261 is a deficient number, since it is larger than the sum of its proper divisors (6955353459).

20855877261 is an equidigital number, since it uses as much as digits as its factorization.

20855877261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848595.

The product of its (nonzero) digits is 1881600, while the sum is 51.

The spelling of 20855877261 in words is "twenty billion, eight hundred fifty-five million, eight hundred seventy-seven thousand, two hundred sixty-one".