20249191 has 4 divisors (see below), whose sum is σ = 20476800. Its totient is φ = 20021584.

The previous prime is 20249189. The next prime is 20249237. The reversal of 20249191 is 19194202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20249191 - 2¹ = 20249189 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 (20249111) 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, 113671 + ... + 113848.

It is an arithmetic number, because the mean of its divisors is an integer number (5119200).

Almost surely, 2^20249191 is an apocalyptic number.

20249191 is a deficient number, since it is larger than the sum of its proper divisors (227609).

20249191 is an equidigital number, since it uses as much as digits as its factorization.

20249191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227608.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 20249191 is about 4499.9101102133. The cubic root of 20249191 is about 272.5644591220.

The spelling of 20249191 in words is "twenty million, two hundred forty-nine thousand, one hundred ninety-one".