20590618201668 has 18 divisors (see below), whose sum is σ = 52048507120974. Its totient is φ = 6863539400544.

The previous prime is 20590618201661. The next prime is 20590618201739. The reversal of 20590618201668 is 86610281609502.

20590618201668 is a `hidden beast` number, since 2 + 0 + 5 + 9 + 0 + 618 + 2 + 0 + 16 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20556140396544 + 34477805124 = 4533888^2 + 185682^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (20590618201661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285980808321 + ... + 285980808392.

It is an arithmetic number, because the mean of its divisors is an integer number (2891583728943).

Almost surely, 2^{20590618201668} is an apocalyptic number.

It is an amenable number.

20590618201668 is an abundant number, since it is smaller than the sum of its proper divisors (31457888919306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20590618201668 is a wasteful number, since it uses less digits than its factorization.

20590618201668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571961616723 (or 571961616718 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 20590618201668 in words is "twenty trillion, five hundred ninety billion, six hundred eighteen million, two hundred one thousand, six hundred sixty-eight".