20131144515 has 64 divisors (see below), whose sum is σ = 36544435200. Its totient is φ = 10512260352.

The previous prime is 20131144511. The next prime is 20131144559. The reversal of 20131144515 is 51544113102.

20131144515 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 1 + 144 + 515 = 666.

It is not a de Polignac number, because 20131144515 - 2² = 20131144511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20131144511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1229412 + ... + 1245678.

It is an arithmetic number, because the mean of its divisors is an integer number (571006800).

Almost surely, 2^20131144515 is an apocalyptic number.

20131144515 is a deficient number, since it is larger than the sum of its proper divisors (16413290685).

20131144515 is a wasteful number, since it uses less digits than its factorization.

20131144515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16473 (or 16467 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 20131144515 its reverse (51544113102), we get a palindrome (71675257617).

The spelling of 20131144515 in words is "twenty billion, one hundred thirty-one million, one hundred forty-four thousand, five hundred fifteen".