20543366866 has 32 divisors (see below), whose sum is σ = 34192811520. Its totient is φ = 9178012800.

The previous prime is 20543366861. The next prime is 20543366867. The reversal of 20543366866 is 66866334502.

It is not an unprimeable number, because it can be changed into a prime (20543366861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2098030 + ... + 2107798.

It is an arithmetic number, because the mean of its divisors is an integer number (1068525360).

Almost surely, 2^20543366866 is an apocalyptic number.

20543366866 is a deficient number, since it is larger than the sum of its proper divisors (13649444654).

20543366866 is a wasteful number, since it uses less digits than its factorization.

20543366866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11410.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 20543366866 in words is "twenty billion, five hundred forty-three million, three hundred sixty-six thousand, eight hundred sixty-six".