20601191 has 8 divisors (see below), whose sum is σ = 22357104. Its totient is φ = 18869760.

The previous prime is 20601179. The next prime is 20601197. The reversal of 20601191 is 19110602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20601191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20601197) 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, 4346 + ... + 7751.

It is an arithmetic number, because the mean of its divisors is an integer number (2794638).

Almost surely, 2^20601191 is an apocalyptic number.

20601191 is a deficient number, since it is larger than the sum of its proper divisors (1755913).

20601191 is a wasteful number, since it uses less digits than its factorization.

20601191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12241.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 20601191 is about 4538.8534895940. The cubic root of 20601191 is about 274.1347615282.

Adding to 20601191 its reverse (19110602), we get a palindrome (39711793).

The spelling of 20601191 in words is "twenty million, six hundred one thousand, one hundred ninety-one".