20323139 has 2 divisors, whose sum is σ = 20323140. Its totient is φ = 20323138.

The previous prime is 20323091. The next prime is 20323151. The reversal of 20323139 is 93132302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20323139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20323169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161569 + 10161570.

It is an arithmetic number, because the mean of its divisors is an integer number (10161570).

Almost surely, 2^20323139 is an apocalyptic number.

20323139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323139 is an equidigital number, since it uses as much as digits as its factorization.

20323139 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 20323139 is about 4508.1192308988. The cubic root of 20323139 is about 272.8958486720.

The spelling of 20323139 in words is "twenty million, three hundred twenty-three thousand, one hundred thirty-nine".