20331329 has 2 divisors, whose sum is σ = 20331330. Its totient is φ = 20331328.

The previous prime is 20331323. The next prime is 20331373. The reversal of 20331329 is 92313302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 1495729 = 4340^2 + 1223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331329 - 2⁴ = 20331313 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20331323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165664 + 10165665.

It is an arithmetic number, because the mean of its divisors is an integer number (10165665).

Almost surely, 2^20331329 is an apocalyptic number.

It is an amenable number.

20331329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331329 is an equidigital number, since it uses as much as digits as its factorization.

20331329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 20331329 is about 4509.0275004706. The cubic root of 20331329 is about 272.9325017507.

The spelling of 20331329 in words is "twenty million, three hundred thirty-one thousand, three hundred twenty-nine".