20891730116 has 24 divisors (see below), whose sum is σ = 38166805824. Its totient is φ = 9987325920.

The previous prime is 20891730109. The next prime is 20891730121. The reversal of 20891730116 is 61103719802.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20891730116.

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, 166871 + ... + 263873.

It is an arithmetic number, because the mean of its divisors is an integer number (1590283576).

Almost surely, 2^20891730116 is an apocalyptic number.

It is an amenable number.

20891730116 is a deficient number, since it is larger than the sum of its proper divisors (17275075708).

20891730116 is a wasteful number, since it uses less digits than its factorization.

20891730116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99371 (or 99369 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 20891730116 in words is "twenty billion, eight hundred ninety-one million, seven hundred thirty thousand, one hundred sixteen".