20130331 has 8 divisors (see below), whose sum is σ = 22265264. Its totient is φ = 18079200.

The previous prime is 20130293. The next prime is 20130343. The reversal of 20130331 is 13303102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20130331 - 2⁷ = 20130203 is a prime.

It is a super-2 number, since 2×20130331² = 810460452339122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20130371) 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, 20445 + ... + 21406.

It is an arithmetic number, because the mean of its divisors is an integer number (2783158).

Almost surely, 2^20130331 is an apocalyptic number.

20130331 is a deficient number, since it is larger than the sum of its proper divisors (2134933).

20130331 is a wasteful number, since it uses less digits than its factorization.

20130331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41901.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 20130331 is about 4486.6837419190. The cubic root of 20130331 is about 272.0301067814.

Adding to 20130331 its reverse (13303102), we get a palindrome (33433433).

The spelling of 20130331 in words is "twenty million, one hundred thirty thousand, three hundred thirty-one".