20855427190927 has 4 divisors (see below), whose sum is σ = 23834773932496. Its totient is φ = 17876080449360.

The previous prime is 20855427190909. The next prime is 20855427190933. The reversal of 20855427190927 is 72909172455802.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20855427190927 is a prime.

It is a super-2 number, since 2×20855427190927² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855427193927) 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, 1489673370774 + ... + 1489673370787.

It is an arithmetic number, because the mean of its divisors is an integer number (5958693483124).

Almost surely, 2^{20855427190927} is an apocalyptic number.

20855427190927 is a deficient number, since it is larger than the sum of its proper divisors (2979346741569).

20855427190927 is an equidigital number, since it uses as much as digits as its factorization.

20855427190927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979346741568.

The product of its (nonzero) digits is 25401600, while the sum is 61.

The spelling of 20855427190927 in words is "twenty trillion, eight hundred fifty-five billion, four hundred twenty-seven million, one hundred ninety thousand, nine hundred twenty-seven".