20691810406116 has 72 divisors (see below), whose sum is σ = 54078759571200. Its totient is φ = 6663994165440.

The previous prime is 20691810406081. The next prime is 20691810406117. The reversal of 20691810406116 is 61160401819602.

20691810406116 is a `hidden beast` number, since 2 + 0 + 6 + 9 + 18 + 10 + 4 + 0 + 611 + 6 = 666.

It is a super-3 number, since 3×20691810406116³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20691810406117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14285811 + ... + 15667418.

Almost surely, 2^{20691810406116} is an apocalyptic number.

It is an amenable number.

20691810406116 is an abundant number, since it is smaller than the sum of its proper divisors (33386949165084).

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

20691810406116 is a wasteful number, since it uses less digits than its factorization.

20691810406116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29953889 (or 29953884 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 20691810406116 in words is "twenty trillion, six hundred ninety-one billion, eight hundred ten million, four hundred six thousand, one hundred sixteen".