20971201 has 4 divisors (see below), whose sum is σ = 21284272. Its totient is φ = 20658132.

The previous prime is 20971157. The next prime is 20971219. The reversal of 20971201 is 10217902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20971201 - 2⁹ = 20970689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20971271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156435 + ... + 156568.

It is an arithmetic number, because the mean of its divisors is an integer number (5321068).

Almost surely, 2^20971201 is an apocalyptic number.

It is an amenable number.

20971201 is a deficient number, since it is larger than the sum of its proper divisors (313071).

20971201 is an equidigital number, since it uses as much as digits as its factorization.

20971201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313070.

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

The square root of 20971201 is about 4579.4323884080. The cubic root of 20971201 is about 275.7662420734.

The spelling of 20971201 in words is "twenty million, nine hundred seventy-one thousand, two hundred one".