20427256147 has 4 divisors (see below), whose sum is σ = 21131644320. Its totient is φ = 19722867976.

The previous prime is 20427256141. The next prime is 20427256163. The reversal of 20427256147 is 74165272402.

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

It is a cyclic number.

It is not a de Polignac number, because 20427256147 - 2¹⁵ = 20427223379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20427256141) 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, 352194043 + ... + 352194100.

It is an arithmetic number, because the mean of its divisors is an integer number (5282911080).

Almost surely, 2^20427256147 is an apocalyptic number.

20427256147 is a deficient number, since it is larger than the sum of its proper divisors (704388173).

20427256147 is an equidigital number, since it uses as much as digits as its factorization.

20427256147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704388172.

The product of its (nonzero) digits is 188160, while the sum is 40.

The spelling of 20427256147 in words is "twenty billion, four hundred twenty-seven million, two hundred fifty-six thousand, one hundred forty-seven".