20004491158447 has 4 divisors (see below), whose sum is σ = 20136971232496. Its totient is φ = 19872011084400.

The previous prime is 20004491158441. The next prime is 20004491158523. The reversal of 20004491158447 is 74485119440002.

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

It is a cyclic number.

It is not a de Polignac number, because 20004491158447 - 2³ = 20004491158439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004491158447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004491158441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66240036798 + ... + 66240037099.

It is an arithmetic number, because the mean of its divisors is an integer number (5034242808124).

Almost surely, 2^{20004491158447} is an apocalyptic number.

20004491158447 is a deficient number, since it is larger than the sum of its proper divisors (132480074049).

20004491158447 is a wasteful number, since it uses less digits than its factorization.

20004491158447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132480074048.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 20004491158447 in words is "twenty trillion, four billion, four hundred ninety-one million, one hundred fifty-eight thousand, four hundred forty-seven".