20159939 has 2 divisors, whose sum is σ = 20159940. Its totient is φ = 20159938.

The previous prime is 20159933. The next prime is 20159941. The reversal of 20159939 is 93995102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20159939 is a prime.

It is a Sophie Germain prime.

Together with 20159941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20159933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10079969 + 10079970.

It is an arithmetic number, because the mean of its divisors is an integer number (10079970).

Almost surely, 2^20159939 is an apocalyptic number.

20159939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20159939 is an equidigital number, since it uses as much as digits as its factorization.

20159939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 20159939 is about 4489.9820712337. The cubic root of 20159939 is about 272.1634101341.

The spelling of 20159939 in words is "twenty million, one hundred fifty-nine thousand, nine hundred thirty-nine".