20517170678 has 8 divisors (see below), whose sum is σ = 30846832968. Its totient is φ = 10234893024.

The previous prime is 20517170621. The next prime is 20517170689. The reversal of 20517170678 is 87607171502.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11845076 + ... + 11846807.

It is an arithmetic number, because the mean of its divisors is an integer number (3855854121).

Almost surely, 2^20517170678 is an apocalyptic number.

20517170678 is a deficient number, since it is larger than the sum of its proper divisors (10329662290).

20517170678 is a wasteful number, since it uses less digits than its factorization.

20517170678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23692318.

The product of its (nonzero) digits is 164640, while the sum is 44.

The spelling of 20517170678 in words is "twenty billion, five hundred seventeen million, one hundred seventy thousand, six hundred seventy-eight".