20661044973 has 8 divisors (see below), whose sum is σ = 27548988000. Its totient is φ = 13773565968.

The previous prime is 20661044959. The next prime is 20661044981. The reversal of 20661044973 is 37944016602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20661044973 - 2¹⁷ = 20660913901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20661044933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6318 + ... + 203376.

It is an arithmetic number, because the mean of its divisors is an integer number (3443623500).

Almost surely, 2^20661044973 is an apocalyptic number.

It is an amenable number.

20661044973 is a deficient number, since it is larger than the sum of its proper divisors (6887943027).

20661044973 is a wasteful number, since it uses less digits than its factorization.

20661044973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232011.

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 20661044973 in words is "twenty billion, six hundred sixty-one million, forty-four thousand, nine hundred seventy-three".