20168516688 has 40 divisors (see below), whose sum is σ = 52110974208. Its totient is φ = 6721681152.

The previous prime is 20168516671. The next prime is 20168516749. The reversal of 20168516688 is 88661586102.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20168516688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272620 + ... + 338612.

Almost surely, 2^20168516688 is an apocalyptic number.

It is an amenable number.

20168516688 is an abundant number, since it is smaller than the sum of its proper divisors (31942457520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20168516688 is a wasteful number, since it uses less digits than its factorization.

20168516688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72371 (or 72365 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 51.

The spelling of 20168516688 in words is "twenty billion, one hundred sixty-eight million, five hundred sixteen thousand, six hundred eighty-eight".