20131329 has 4 divisors (see below), whose sum is σ = 26841776. Its totient is φ = 13420884.

The previous prime is 20131313. The next prime is 20131339. The reversal of 20131329 is 92313102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20131329 - 2⁴ = 20131313 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 3355219 + ... + 3355224.

It is an arithmetic number, because the mean of its divisors is an integer number (6710444).

Almost surely, 2^20131329 is an apocalyptic number.

It is an amenable number.

20131329 is a deficient number, since it is larger than the sum of its proper divisors (6710447).

20131329 is an equidigital number, since it uses as much as digits as its factorization.

20131329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710446.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 20131329 is about 4486.7949585422. The cubic root of 20131329 is about 272.0346021795.

The spelling of 20131329 in words is "twenty million, one hundred thirty-one thousand, three hundred twenty-nine".