20855880367 has 4 divisors (see below), whose sum is σ = 23835291856. Its totient is φ = 17876468880.

The previous prime is 20855880359. The next prime is 20855880371. The reversal of 20855880367 is 76308855802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76308855802 = 2 ⋅38154427901.

It is a cyclic number.

It is not a de Polignac number, because 20855880367 - 2³ = 20855880359 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 (20855880307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489705734 + ... + 1489705747.

It is an arithmetic number, because the mean of its divisors is an integer number (5958822964).

Almost surely, 2^20855880367 is an apocalyptic number.

20855880367 is a deficient number, since it is larger than the sum of its proper divisors (2979411489).

20855880367 is an equidigital number, since it uses as much as digits as its factorization.

20855880367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979411488.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 20855880367 in words is "twenty billion, eight hundred fifty-five million, eight hundred eighty thousand, three hundred sixty-seven".