20159947 has 2 divisors, whose sum is σ = 20159948. Its totient is φ = 20159946.

The previous prime is 20159941. The next prime is 20159957. The reversal of 20159947 is 74995102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20159947 - 2³ = 20159939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20159941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10079973 + 10079974.

It is an arithmetic number, because the mean of its divisors is an integer number (10079974).

Almost surely, 2^20159947 is an apocalyptic number.

20159947 is a deficient number, since it is larger than the sum of its proper divisors (1).

20159947 is an equidigital number, since it uses as much as digits as its factorization.

20159947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20159947 is about 4489.9829621058. The cubic root of 20159947 is about 272.1634461347.

The spelling of 20159947 in words is "twenty million, one hundred fifty-nine thousand, nine hundred forty-seven".