20664741818 has 16 divisors (see below), whose sum is σ = 35428518720. Its totient is φ = 8855506176.

The previous prime is 20664741803. The next prime is 20664741821. The reversal of 20664741818 is 81814746602.

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, 105905 + ... + 229227.

It is an arithmetic number, because the mean of its divisors is an integer number (2214282420).

Almost surely, 2^20664741818 is an apocalyptic number.

20664741818 is a deficient number, since it is larger than the sum of its proper divisors (14763776902).

20664741818 is a wasteful number, since it uses less digits than its factorization.

20664741818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135301.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 20664741818 in words is "twenty billion, six hundred sixty-four million, seven hundred forty-one thousand, eight hundred eighteen".