20016868386891 has 32 divisors (see below), whose sum is σ = 28497920901120. Its totient is φ = 12467227205664.

The previous prime is 20016868386887. The next prime is 20016868386919. The reversal of 20016868386891 is 19868386861002.

It is not a de Polignac number, because 20016868386891 - 2² = 20016868386887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20016868386841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211639270 + ... + 211733828.

It is an arithmetic number, because the mean of its divisors is an integer number (890560028160).

Almost surely, 2^{20016868386891} is an apocalyptic number.

20016868386891 is a deficient number, since it is larger than the sum of its proper divisors (8481052514229).

20016868386891 is a wasteful number, since it uses less digits than its factorization.

20016868386891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165975.

The product of its (nonzero) digits is 47775744, while the sum is 66.

The spelling of 20016868386891 in words is "twenty trillion, sixteen billion, eight hundred sixty-eight million, three hundred eighty-six thousand, eight hundred ninety-one".