20668333507557 has 8 divisors (see below), whose sum is σ = 28508046217440. Its totient is φ = 13303754901360.

The previous prime is 20668333507543. The next prime is 20668333507567. The reversal of 20668333507557 is 75570533386602.

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

It is not a de Polignac number, because 20668333507557 - 2⁸ = 20668333507301 is a prime.

It is a super-2 number, since 2×20668333507557² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20668333507557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668333507567) 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, 118783525819 + ... + 118783525992.

It is an arithmetic number, because the mean of its divisors is an integer number (3563505777180).

Almost surely, 2^{20668333507557} is an apocalyptic number.

It is an amenable number.

20668333507557 is a deficient number, since it is larger than the sum of its proper divisors (7839712709883).

20668333507557 is a wasteful number, since it uses less digits than its factorization.

20668333507557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237567051843.

The product of its (nonzero) digits is 95256000, while the sum is 60.

The spelling of 20668333507557 in words is "twenty trillion, six hundred sixty-eight billion, three hundred thirty-three million, five hundred seven thousand, five hundred fifty-seven".