20665567012 has 24 divisors (see below), whose sum is σ = 36495581976. Its totient is φ = 10238312448.

The previous prime is 20665567009. The next prime is 20665567031. The reversal of 20665567012 is 21076556602.

It can be written as a sum of positive squares in 4 ways, for example, as 644448996 + 20021118016 = 25386^2 + 141496^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2958468 + ... + 2965444.

It is an arithmetic number, because the mean of its divisors is an integer number (1520649249).

Almost surely, 2^20665567012 is an apocalyptic number.

It is an amenable number.

20665567012 is a deficient number, since it is larger than the sum of its proper divisors (15830014964).

20665567012 is a wasteful number, since it uses less digits than its factorization.

20665567012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13647 (or 13645 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 20665567012 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, twelve".