20171217686396 has 36 divisors (see below), whose sum is σ = 41063092545888. Its totient is φ = 8644753571328.

The previous prime is 20171217686363. The next prime is 20171217686449. The reversal of 20171217686396 is 69368671217102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58750940 + ... + 59093276.

It is an arithmetic number, because the mean of its divisors is an integer number (1140641459608).

Almost surely, 2^{20171217686396} is an apocalyptic number.

It is an amenable number.

20171217686396 is an abundant number, since it is smaller than the sum of its proper divisors (20891874859492).

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

20171217686396 is a wasteful number, since it uses less digits than its factorization.

20171217686396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642978 (or 642969 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 20171217686396 in words is "twenty trillion, one hundred seventy-one billion, two hundred seventeen million, six hundred eighty-six thousand, three hundred ninety-six".