20531100013042 has 16 divisors (see below), whose sum is σ = 30858385757400. Its totient is φ = 10244973038080.

The previous prime is 20531100013031. The next prime is 20531100013063. The reversal of 20531100013042 is 24031000113502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20206472415921 + 324627597121 = 4495161^2 + 569761^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25965492 + ... + 26744512.

Almost surely, 2^{20531100013042} is an apocalyptic number.

20531100013042 is a deficient number, since it is larger than the sum of its proper divisors (10327285744358).

20531100013042 is a wasteful number, since it uses less digits than its factorization.

20531100013042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805421.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20531100013042 its reverse (24031000113502), we get a palindrome (44562100126544).

The spelling of 20531100013042 in words is "twenty trillion, five hundred thirty-one billion, one hundred million, thirteen thousand, forty-two".