20968347843 has 6 divisors (see below), whose sum is σ = 30287613564. Its totient is φ = 13978898556.

The previous prime is 20968347839. The next prime is 20968347857. The reversal of 20968347843 is 34874386902.

20968347843 is a `hidden beast` number, since 2 + 0 + 96 + 83 + 478 + 4 + 3 = 666.

It is not a de Polignac number, because 20968347843 - 2² = 20968347839 is a prime.

It is a super-2 number, since 2×20968347843² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20968347843.

It is not an unprimeable number, because it can be changed into a prime (20968347863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1164908205 + ... + 1164908222.

It is an arithmetic number, because the mean of its divisors is an integer number (5047935594).

Almost surely, 2^20968347843 is an apocalyptic number.

20968347843 is a deficient number, since it is larger than the sum of its proper divisors (9319265721).

20968347843 is a wasteful number, since it uses less digits than its factorization.

20968347843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329816433 (or 2329816430 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 20968347843 in words is "twenty billion, nine hundred sixty-eight million, three hundred forty-seven thousand, eight hundred forty-three".