20641533517271 has 8 divisors (see below), whose sum is σ = 21734038588080. Its totient is φ = 19549639303488.

The previous prime is 20641533517237. The next prime is 20641533517291. The reversal of 20641533517271 is 17271533514602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20641533517271 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 (20641533517291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152644886 + ... + 152780051.

It is an arithmetic number, because the mean of its divisors is an integer number (2716754823510).

Almost surely, 2^{20641533517271} is an apocalyptic number.

20641533517271 is a deficient number, since it is larger than the sum of its proper divisors (1092505070809).

20641533517271 is a wasteful number, since it uses less digits than its factorization.

20641533517271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305428513.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The spelling of 20641533517271 in words is "twenty trillion, six hundred forty-one billion, five hundred thirty-three million, five hundred seventeen thousand, two hundred seventy-one".