20557706211601 has 8 divisors (see below), whose sum is σ = 22139129897024. Its totient is φ = 18976291336080.

The previous prime is 20557706211599. The next prime is 20557706211613. The reversal of 20557706211601 is 10611260775502.

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

It is not a de Polignac number, because 20557706211601 - 2¹ = 20557706211599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20557706211631) 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, 3120460 + ... + 7131106.

It is an arithmetic number, because the mean of its divisors is an integer number (2767391237128).

Almost surely, 2^{20557706211601} is an apocalyptic number.

It is an amenable number.

20557706211601 is a deficient number, since it is larger than the sum of its proper divisors (1581423685423).

20557706211601 is a wasteful number, since it uses less digits than its factorization.

20557706211601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404951.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 20557706211601 in words is "twenty trillion, five hundred fifty-seven billion, seven hundred six million, two hundred eleven thousand, six hundred one".