20661466205 has 32 divisors (see below), whose sum is σ = 26998147584. Its totient is φ = 15120342016.

The previous prime is 20661466181. The next prime is 20661466223. The reversal of 20661466205 is 50266416602.

It is not a de Polignac number, because 20661466205 - 2³² = 16366498909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 460604 + ... + 503466.

It is an arithmetic number, because the mean of its divisors is an integer number (843692112).

Almost surely, 2^20661466205 is an apocalyptic number.

It is an amenable number.

20661466205 is a deficient number, since it is larger than the sum of its proper divisors (6336681379).

20661466205 is a wasteful number, since it uses less digits than its factorization.

20661466205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43045.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 20661466205 in words is "twenty billion, six hundred sixty-one million, four hundred sixty-six thousand, two hundred five".