20131142515 has 16 divisors (see below), whose sum is σ = 26966370816. Its totient is φ = 14300344800.

The previous prime is 20131142513. The next prime is 20131142567. The reversal of 20131142515 is 51524113102.

It is not a de Polignac number, because 20131142515 - 2¹ = 20131142513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131142515.

It is not an unprimeable number, because it can be changed into a prime (20131142513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4253691 + ... + 4258420.

It is an arithmetic number, because the mean of its divisors is an integer number (1685398176).

Almost surely, 2^20131142515 is an apocalyptic number.

20131142515 is a deficient number, since it is larger than the sum of its proper divisors (6835228301).

20131142515 is a wasteful number, since it uses less digits than its factorization.

20131142515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8512170.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20131142515 its reverse (51524113102), we get a palindrome (71655255617).

The spelling of 20131142515 in words is "twenty billion, one hundred thirty-one million, one hundred forty-two thousand, five hundred fifteen".