20931951896616 has 32 divisors (see below), whose sum is σ = 53066920305600. Its totient is φ = 6879045223680.

The previous prime is 20931951896593. The next prime is 20931951896623. The reversal of 20931951896616 is 61669815913902.

It is a super-3 number, since 3×20931951896616³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 6142002961 + ... + 6142006368.

It is an arithmetic number, because the mean of its divisors is an integer number (1658341259550).

Almost surely, 2^{20931951896616} is an apocalyptic number.

It is an amenable number.

20931951896616 is an abundant number, since it is smaller than the sum of its proper divisors (32134968408984).

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

20931951896616 is a wasteful number, since it uses less digits than its factorization.

20931951896616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12284009409 (or 12284009405 counting only the distinct ones).

The product of its (nonzero) digits is 37791360, while the sum is 66.

The spelling of 20931951896616 in words is "twenty trillion, nine hundred thirty-one billion, nine hundred fifty-one million, eight hundred ninety-six thousand, six hundred sixteen".