20671159 has 2 divisors, whose sum is σ = 20671160. Its totient is φ = 20671158.

The previous prime is 20671151. The next prime is 20671163. The reversal of 20671159 is 95117602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20671159 - 2³ = 20671151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20671159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20671151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335579 + 10335580.

It is an arithmetic number, because the mean of its divisors is an integer number (10335580).

Almost surely, 2^20671159 is an apocalyptic number.

20671159 is a deficient number, since it is larger than the sum of its proper divisors (1).

20671159 is an equidigital number, since it uses as much as digits as its factorization.

20671159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 20671159 is about 4546.5546296069. The cubic root of 20671159 is about 274.4447595828. Note that the first 3 decimals are identical.

The spelling of 20671159 in words is "twenty million, six hundred seventy-one thousand, one hundred fifty-nine".