20331139 has 2 divisors, whose sum is σ = 20331140. Its totient is φ = 20331138.

The previous prime is 20331127. The next prime is 20331151. The reversal of 20331139 is 93113302.

It is a balanced prime because it is at equal distance from previous prime (20331127) and next prime (20331151).

It is a cyclic number.

It is not a de Polignac number, because 20331139 - 2⁵ = 20331107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20331109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165569 + 10165570.

It is an arithmetic number, because the mean of its divisors is an integer number (10165570).

Almost surely, 2^20331139 is an apocalyptic number.

20331139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331139 is an equidigital number, since it uses as much as digits as its factorization.

20331139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 20331139 is about 4509.0064315767. The cubic root of 20331139 is about 272.9316515466.

The spelling of 20331139 in words is "twenty million, three hundred thirty-one thousand, one hundred thirty-nine".