20909201 has 8 divisors (see below), whose sum is σ = 22186080. Its totient is φ = 19637568.

The previous prime is 20909183. The next prime is 20909209. The reversal of 20909201 is 10290902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20909201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20909209) 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, 9530 + ... + 11516.

It is an arithmetic number, because the mean of its divisors is an integer number (2773260).

Almost surely, 2^20909201 is an apocalyptic number.

It is an amenable number.

20909201 is a deficient number, since it is larger than the sum of its proper divisors (1276879).

20909201 is a wasteful number, since it uses less digits than its factorization.

20909201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 20909201 is about 4572.6579797750. The cubic root of 20909201 is about 275.4942121285.

The spelling of 20909201 in words is "twenty million, nine hundred nine thousand, two hundred one".