20131330 has 16 divisors (see below), whose sum is σ = 37216440. Its totient is φ = 7834752.

The previous prime is 20131313. The next prime is 20131339. The reversal of 20131330 is 3313102.

It can be written as a sum of positive squares in 4 ways, for example, as 16719921 + 3411409 = 4089^2 + 1847^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20131330.

It is not an unprimeable number, because it can be changed into a prime (20131339) 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, 26835 + ... + 27574.

Almost surely, 2^20131330 is an apocalyptic number.

20131330 is a deficient number, since it is larger than the sum of its proper divisors (17085110).

20131330 is a wasteful number, since it uses less digits than its factorization.

20131330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54453.

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

The square root of 20131330 is about 4486.7950699804. The cubic root of 20131330 is about 272.0346066839.

Adding to 20131330 its reverse (3313102), we get a palindrome (23444432).

The spelling of 20131330 in words is "twenty million, one hundred thirty-one thousand, three hundred thirty".