20130312 has 32 divisors (see below), whose sum is σ = 53287200. Its totient is φ = 6315264.

The previous prime is 20130293. The next prime is 20130343. The reversal of 20130312 is 21303102.

It is a happy number.

It is a super-2 number, since 2×20130312² = 810458922434688, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24262 + ... + 25077.

It is an arithmetic number, because the mean of its divisors is an integer number (1665225).

Almost surely, 2^20130312 is an apocalyptic number.

It is an amenable number.

20130312 is an abundant number, since it is smaller than the sum of its proper divisors (33156888).

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

20130312 is a wasteful number, since it uses less digits than its factorization.

20130312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49365 (or 49361 counting only the distinct ones).

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

The square root of 20130312 is about 4486.6816245417. The cubic root of 20130312 is about 272.0300211962.

Adding to 20130312 its reverse (21303102), we get a palindrome (41433414).

The spelling of 20130312 in words is "twenty million, one hundred thirty thousand, three hundred twelve".