20688490271 has 8 divisors (see below), whose sum is σ = 22724200320. Its totient is φ = 18747464472.

The previous prime is 20688490261. The next prime is 20688490301. The reversal of 20688490271 is 17209488602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20688490271 - 2¹⁰ = 20688489247 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 (20688490261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23670605 + ... + 23671478.

It is an arithmetic number, because the mean of its divisors is an integer number (2840525040).

Almost surely, 2^20688490271 is an apocalyptic number.

20688490271 is a deficient number, since it is larger than the sum of its proper divisors (2035710049).

20688490271 is a wasteful number, since it uses less digits than its factorization.

20688490271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47342125.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 20688490271 in words is "twenty billion, six hundred eighty-eight million, four hundred ninety thousand, two hundred seventy-one".