20001686686686 has 32 divisors (see below), whose sum is σ = 44592975060480. Its totient is φ = 6645511532088.

The previous prime is 20001686686669. The next prime is 20001686686691. The reversal of 20001686686686 is 68668668610002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603243366 + ... + 603276521.

It is an arithmetic number, because the mean of its divisors is an integer number (1393530470640).

Almost surely, 2^{20001686686686} is an apocalyptic number.

20001686686686 is an abundant number, since it is smaller than the sum of its proper divisors (24591288373794).

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

20001686686686 is a wasteful number, since it uses less digits than its factorization.

20001686686686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206520205 (or 1206520199 counting only the distinct ones).

The product of its (nonzero) digits is 47775744, while the sum is 63.

The spelling of 20001686686686 in words is "twenty trillion, one billion, six hundred eighty-six million, six hundred eighty-six thousand, six hundred eighty-six".