20131281515064 has 64 divisors (see below), whose sum is σ = 50360977693440. Its totient is φ = 6706058641920.

The previous prime is 20131281515017. The next prime is 20131281515101. The reversal of 20131281515064 is 46051518213102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265886637 + ... + 265962339.

It is an arithmetic number, because the mean of its divisors is an integer number (786890276460).

Almost surely, 2^{20131281515064} is an apocalyptic number.

20131281515064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20131281515064 is an abundant number, since it is smaller than the sum of its proper divisors (30229696178376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20131281515064 is a wasteful number, since it uses less digits than its factorization.

20131281515064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82780 (or 82776 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

Adding to 20131281515064 its reverse (46051518213102), we get a palindrome (66182799728166).

The spelling of 20131281515064 in words is "twenty trillion, one hundred thirty-one billion, two hundred eighty-one million, five hundred fifteen thousand, sixty-four".