20136543131506 has 8 divisors (see below), whose sum is σ = 30204976711644. Its totient is φ = 10068217560960.

The previous prime is 20136543131459. The next prime is 20136543131543. The reversal of 20136543131506 is 60513134563102.

It can be written as a sum of positive squares in 2 ways, for example, as 13301272762281 + 6835270369225 = 3647091^2 + 2614435^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26534695 + ... + 27283018.

Almost surely, 2^{20136543131506} is an apocalyptic number.

20136543131506 is a deficient number, since it is larger than the sum of its proper divisors (10068433580138).

20136543131506 is a wasteful number, since it uses less digits than its factorization.

20136543131506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54004796.

The product of its (nonzero) digits is 194400, while the sum is 40.

Adding to 20136543131506 its reverse (60513134563102), we get a palindrome (80649677694608).

The spelling of 20136543131506 in words is "twenty trillion, one hundred thirty-six billion, five hundred forty-three million, one hundred thirty-one thousand, five hundred six".