20131512 has 16 divisors (see below), whose sum is σ = 50328840. Its totient is φ = 6710496.

The previous prime is 20131499. The next prime is 20131513. The reversal of 20131512 is 21513102.

It is a super-2 number, since 2×20131512² = 810555550812288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20131491 and 20131500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419383 + ... + 419430.

Almost surely, 2^20131512 is an apocalyptic number.

It is an amenable number.

20131512 is an abundant number, since it is smaller than the sum of its proper divisors (30197328).

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

20131512 is a wasteful number, since it uses less digits than its factorization.

20131512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838822 (or 838818 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 20131512 is about 4486.8153516721. The cubic root of 20131512 is about 272.0354264699.

Adding to 20131512 its reverse (21513102), we get a palindrome (41644614).

It can be divided in two parts, 201 and 31512, that added together give a palindrome (31713).

The spelling of 20131512 in words is "twenty million, one hundred thirty-one thousand, five hundred twelve".