20131030 has 16 divisors (see below), whose sum is σ = 36357984. Its totient is φ = 8025280.

The previous prime is 20131019. The next prime is 20131031. The reversal of 20131030 is 3013102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20130998 and 20131016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131031) 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 in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (2272374).

Almost surely, 2^20131030 is an apocalyptic number.

20131030 is a deficient number, since it is larger than the sum of its proper divisors (16226954).

20131030 is a wasteful number, since it uses less digits than its factorization.

20131030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6791.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20131030 is about 4486.7616384203. The cubic root of 20131030 is about 272.0332553774.

Adding to 20131030 its reverse (3013102), we get a palindrome (23144132).

The spelling of 20131030 in words is "twenty million, one hundred thirty-one thousand, thirty".