20515542330123 has 6 divisors (see below), whose sum is σ = 29633561143524. Its totient is φ = 13677028220076.

The previous prime is 20515542330113. The next prime is 20515542330131. The reversal of 20515542330123 is 32103324551502.

20515542330123 is a `hidden beast` number, since 2 + 0 + 51 + 554 + 2 + 3 + 30 + 1 + 23 = 666.

It is not a de Polignac number, because 20515542330123 - 2⁵ = 20515542330091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20515542330113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139752351665 + ... + 1139752351682.

It is an arithmetic number, because the mean of its divisors is an integer number (4938926857254).

Almost surely, 2^{20515542330123} is an apocalyptic number.

20515542330123 is a deficient number, since it is larger than the sum of its proper divisors (9118018813401).

20515542330123 is a wasteful number, since it uses less digits than its factorization.

20515542330123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279504703353 (or 2279504703350 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 20515542330123 its reverse (32103324551502), we get a palindrome (52618866881625).

The spelling of 20515542330123 in words is "twenty trillion, five hundred fifteen billion, five hundred forty-two million, three hundred thirty thousand, one hundred twenty-three".