20179217 has 2 divisors, whose sum is σ = 20179218. Its totient is φ = 20179216.

The previous prime is 20179189. The next prime is 20179231. The reversal of 20179217 is 71297102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 99856 = 4481^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 20179217 - 2¹² = 20175121 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20179217.

It is not a weakly prime, because it can be changed into another prime (20179267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10089608 + 10089609.

It is an arithmetic number, because the mean of its divisors is an integer number (10089609).

Almost surely, 2^20179217 is an apocalyptic number.

It is an amenable number.

20179217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20179217 is an equidigital number, since it uses as much as digits as its factorization.

20179217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 20179217 is about 4492.1283374365. The cubic root of 20179217 is about 272.2501348459.

The spelling of 20179217 in words is "twenty million, one hundred seventy-nine thousand, two hundred seventeen".