20331312 has 40 divisors (see below), whose sum is σ = 52693056. Its totient is φ = 6755136.

The previous prime is 20331301. The next prime is 20331313. The reversal of 20331312 is 21313302.

It is a junction number, because it is equal to n+sod(n) for n = 20331291 and 20331300.

It is not an unprimeable number, because it can be changed into a prime (20331313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21963 + ... + 22869.

Almost surely, 2^20331312 is an apocalyptic number.

It is an amenable number.

20331312 is an abundant number, since it is smaller than the sum of its proper divisors (32361744).

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

20331312 is a wasteful number, since it uses less digits than its factorization.

20331312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20331312 is about 4509.0256153630. The cubic root of 20331312 is about 272.9324256800.

Adding to 20331312 its reverse (21313302), we get a palindrome (41644614).

The spelling of 20331312 in words is "twenty million, three hundred thirty-one thousand, three hundred twelve".