20031312 has 40 divisors (see below), whose sum is σ = 59141056. Its totient is φ = 5723136.

The previous prime is 20031311. The next prime is 20031313. The reversal of 20031312 is 21313002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20031311) and next prime (20031313).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29473 + ... + 30144.

Almost surely, 2^20031312 is an apocalyptic number.

It is an amenable number.

20031312 is an abundant number, since it is smaller than the sum of its proper divisors (39109744).

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

20031312 is a wasteful number, since it uses less digits than its factorization.

20031312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59635 (or 59629 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20031312 is about 4475.6353738883. The cubic root of 20031312 is about 271.5833442053.

Adding to 20031312 its reverse (21313002), we get a palindrome (41344314).

The spelling of 20031312 in words is "twenty million, thirty-one thousand, three hundred twelve".