20008275658781 has 4 divisors (see below), whose sum is σ = 21185233050492. Its totient is φ = 18831318267072.

The previous prime is 20008275658711. The next prime is 20008275658801. The reversal of 20008275658781 is 18785657280002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13294263976900 + 6714011681881 = 3646130^2 + 2591141^2 .

It is a cyclic number.

It is not a de Polignac number, because 20008275658781 - 2¹⁰ = 20008275657757 is a prime.

It is a super-2 number, since 2×20008275658781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20008275658781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20008275658711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 588478695830 + ... + 588478695863.

It is an arithmetic number, because the mean of its divisors is an integer number (5296308262623).

Almost surely, 2^{20008275658781} is an apocalyptic number.

It is an amenable number.

20008275658781 is a deficient number, since it is larger than the sum of its proper divisors (1176957391711).

20008275658781 is a wasteful number, since it uses less digits than its factorization.

20008275658781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176957391710.

The product of its (nonzero) digits is 15052800, while the sum is 59.

The spelling of 20008275658781 in words is "twenty trillion, eight billion, two hundred seventy-five million, six hundred fifty-eight thousand, seven hundred eighty-one".