20271266251 has 4 divisors (see below), whose sum is σ = 20273220792. Its totient is φ = 20269311712.

The previous prime is 20271266219. The next prime is 20271266273. The reversal of 20271266251 is 15266217202.

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 20271266251 - 2⁵ = 20271266219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20271266201) 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, 961630 + ... + 982483.

It is an arithmetic number, because the mean of its divisors is an integer number (5068305198).

Almost surely, 2^20271266251 is an apocalyptic number.

20271266251 is a deficient number, since it is larger than the sum of its proper divisors (1954541).

20271266251 is a wasteful number, since it uses less digits than its factorization.

20271266251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954540.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20271266251 in words is "twenty billion, two hundred seventy-one million, two hundred sixty-six thousand, two hundred fifty-one".