20131312 has 10 divisors (see below), whose sum is σ = 39004448. Its totient is φ = 10065648.

The previous prime is 20131303. The next prime is 20131313. The reversal of 20131312 is 21313102.

It is a junction number, because it is equal to n+sod(n) for n = 20131292 and 20131301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131313) 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 as a sum of consecutive naturals, namely, 629088 + ... + 629119.

Almost surely, 2^20131312 is an apocalyptic number.

It is an amenable number.

20131312 is a deficient number, since it is larger than the sum of its proper divisors (18873136).

20131312 is a wasteful number, since it uses less digits than its factorization.

20131312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258215 (or 1258209 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20131312 is about 4486.7930640938. The cubic root of 20131312 is about 272.0345256059.

Adding to 20131312 its reverse (21313102), we get a palindrome (41444414).

It can be divided in two parts, 201 and 31312, that added together give a palindrome (31513).

The spelling of 20131312 in words is "twenty million, one hundred thirty-one thousand, three hundred twelve".