20117201 has 4 divisors (see below), whose sum is σ = 21664692. Its totient is φ = 18569712.

The previous prime is 20117179. The next prime is 20117231. The reversal of 20117201 is 10271102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12609601 + 7507600 = 3551^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117201 - 2¹⁰ = 20116177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20117231) 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, 773726 + ... + 773751.

It is an arithmetic number, because the mean of its divisors is an integer number (5416173).

Almost surely, 2^20117201 is an apocalyptic number.

It is an amenable number.

20117201 is a deficient number, since it is larger than the sum of its proper divisors (1547491).

20117201 is a wasteful number, since it uses less digits than its factorization.

20117201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547490.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20117201 is about 4485.2202844453. The cubic root of 20117201 is about 271.9709500766.

Adding to 20117201 its reverse (10271102), we get a palindrome (30388303).

The spelling of 20117201 in words is "twenty million, one hundred seventeen thousand, two hundred one".