20344191 has 16 divisors (see below), whose sum is σ = 31839744. Its totient is φ = 11310624.

The previous prime is 20344187. The next prime is 20344199. The reversal of 20344191 is 19144302.

It is not a de Polignac number, because 20344191 - 2² = 20344187 is a prime.

It is a super-2 number, since 2×20344191² = 827772214888962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344199) 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 15 ways as a sum of consecutive naturals, for example, 12315 + ... + 13868.

It is an arithmetic number, because the mean of its divisors is an integer number (1989984).

Almost surely, 2^20344191 is an apocalyptic number.

20344191 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20344191 is a deficient number, since it is larger than the sum of its proper divisors (11495553).

20344191 is a wasteful number, since it uses less digits than its factorization.

20344191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26230.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20344191 is about 4510.4535248686. The cubic root of 20344191 is about 272.9900437808.

Adding to 20344191 its reverse (19144302), we get a palindrome (39488493).

The spelling of 20344191 in words is "twenty million, three hundred forty-four thousand, one hundred ninety-one".