20849630868 has 72 divisors (see below), whose sum is σ = 57513377376. Its totient is φ = 6315988800.

The previous prime is 20849630843. The next prime is 20849630887. The reversal of 20849630868 is 86803694802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1546798 + ... + 1560218.

It is an arithmetic number, because the mean of its divisors is an integer number (798796908).

Almost surely, 2^20849630868 is an apocalyptic number.

It is an amenable number.

20849630868 is an abundant number, since it is smaller than the sum of its proper divisors (36663746508).

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

20849630868 is a wasteful number, since it uses less digits than its factorization.

20849630868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17365 (or 17360 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 20849630868 in words is "twenty billion, eight hundred forty-nine million, six hundred thirty thousand, eight hundred sixty-eight".