20668464271 has 16 divisors (see below), whose sum is σ = 26776960000. Its totient is φ = 15492381408.

The previous prime is 20668464259. The next prime is 20668464281. The reversal of 20668464271 is 17246486602.

It is a happy number.

It is not a de Polignac number, because 20668464271 - 2⁹ = 20668463759 is a prime.

It is a super-2 number, since 2×20668464271² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668464211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5975271 + ... + 5978728.

It is an arithmetic number, because the mean of its divisors is an integer number (1673560000).

Almost surely, 2^20668464271 is an apocalyptic number.

20668464271 is a deficient number, since it is larger than the sum of its proper divisors (6108495729).

20668464271 is a wasteful number, since it uses less digits than its factorization.

20668464271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11954038.

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 20668464271 in words is "twenty billion, six hundred sixty-eight million, four hundred sixty-four thousand, two hundred seventy-one".