20159047 has 2 divisors, whose sum is σ = 20159048. Its totient is φ = 20159046.

The previous prime is 20159033. The next prime is 20159107. The reversal of 20159047 is 74095102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20159047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20159747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10079523 + 10079524.

It is an arithmetic number, because the mean of its divisors is an integer number (10079524).

Almost surely, 2^20159047 is an apocalyptic number.

20159047 is a deficient number, since it is larger than the sum of its proper divisors (1).

20159047 is an equidigital number, since it uses as much as digits as its factorization.

20159047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20159047 is about 4489.8827378897. The cubic root of 20159047 is about 272.1593960125.

It can be divided in two parts, 2015904 and 7, that multiplied together give a triangular number (14111328 = T₅₃₁₂).

The spelling of 20159047 in words is "twenty million, one hundred fifty-nine thousand, forty-seven".