20671820514 has 64 divisors (see below), whose sum is σ = 48825089280. Its totient is φ = 6460542720.

The previous prime is 20671820459. The next prime is 20671820563. The reversal of 20671820514 is 41502817602.

20671820514 is a `hidden beast` number, since 2 + 0 + 67 + 1 + 82 + 0 + 514 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198624 + ... + 284244.

It is an arithmetic number, because the mean of its divisors is an integer number (762892020).

Almost surely, 2^20671820514 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671820514, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24412544640).

20671820514 is an abundant number, since it is smaller than the sum of its proper divisors (28153268766).

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

20671820514 is a wasteful number, since it uses less digits than its factorization.

20671820514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85912 (or 85906 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 20671820514 in words is "twenty billion, six hundred seventy-one million, eight hundred twenty thousand, five hundred fourteen".