20617159 has 4 divisors (see below), whose sum is σ = 21006216. Its totient is φ = 20228104.

The previous prime is 20617151. The next prime is 20617213. The reversal of 20617159 is 95171602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20617159 - 2³ = 20617151 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20617159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20617151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194449 + ... + 194554.

It is an arithmetic number, because the mean of its divisors is an integer number (5251554).

Almost surely, 2^20617159 is an apocalyptic number.

20617159 is a deficient number, since it is larger than the sum of its proper divisors (389057).

20617159 is an equidigital number, since it uses as much as digits as its factorization.

20617159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389056.

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

The square root of 20617159 is about 4540.6121833955. The cubic root of 20617159 is about 274.2055705960.

The spelling of 20617159 in words is "twenty million, six hundred seventeen thousand, one hundred fifty-nine".