20131002 has 24 divisors (see below), whose sum is σ = 43741620. Its totient is φ = 6691200.

The previous prime is 20130983. The next prime is 20131019. The reversal of 20131002 is 20013102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16966161 + 3164841 = 4119^2 + 1779^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 5824 + ... + 8612.

Almost surely, 2^20131002 is an apocalyptic number.

20131002 is an abundant number, since it is smaller than the sum of its proper divisors (23610618).

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

20131002 is a wasteful number, since it uses less digits than its factorization.

20131002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 3195 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20131002 is about 4486.7585181287. The cubic root of 20131002 is about 272.0331292548.

Adding to 20131002 its reverse (20013102), we get a palindrome (40144104).

It can be divided in two parts, 2013100 and 2, that added together give a palindrome (2013102).

The spelling of 20131002 in words is "twenty million, one hundred thirty-one thousand, two".