20917201 has 8 divisors (see below), whose sum is σ = 21421224. Its totient is φ = 20419200.

The previous prime is 20917187. The next prime is 20917223. The reversal of 20917201 is 10271902.

It can be written as a sum of positive squares in 4 ways, for example, as 3478225 + 17438976 = 1865^2 + 4176^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20917201 - 2⁷ = 20917073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20917241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5955 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (2677653).

Almost surely, 2^20917201 is an apocalyptic number.

It is an amenable number.

20917201 is a deficient number, since it is larger than the sum of its proper divisors (504023).

20917201 is a wasteful number, since it uses less digits than its factorization.

20917201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20917201 is about 4573.5326608651. The cubic root of 20917201 is about 275.5293429572.

The spelling of 20917201 in words is "twenty million, nine hundred seventeen thousand, two hundred one".