20688576667 has 8 divisors (see below), whose sum is σ = 22585391280. Its totient is φ = 18794434560.

The previous prime is 20688576641. The next prime is 20688576679. The reversal of 20688576667 is 76667588602.

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

It is not a de Polignac number, because 20688576667 - 2¹⁵ = 20688543899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20688576697) 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, 651918 + ... + 682915.

It is an arithmetic number, because the mean of its divisors is an integer number (2823173910).

Almost surely, 2^20688576667 is an apocalyptic number.

20688576667 is a deficient number, since it is larger than the sum of its proper divisors (1896814613).

20688576667 is a wasteful number, since it uses less digits than its factorization.

20688576667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336253.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 20688576667 in words is "twenty billion, six hundred eighty-eight million, five hundred seventy-six thousand, six hundred sixty-seven".