20057611566 has 8 divisors (see below), whose sum is σ = 40115223144. Its totient is φ = 6685870520.

The previous prime is 20057611549. The next prime is 20057611631. The reversal of 20057611566 is 66511675002.

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

20057611566 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 1671467625 + ... + 1671467636.

It is an arithmetic number, because the mean of its divisors is an integer number (5014402893).

Almost surely, 2^20057611566 is an apocalyptic number.

20057611566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20057611566 is a wasteful number, since it uses less digits than its factorization.

20057611566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342935266.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20057611566 in words is "twenty billion, fifty-seven million, six hundred eleven thousand, five hundred sixty-six".