20191449 has 4 divisors (see below), whose sum is σ = 26921936. Its totient is φ = 13460964.

The previous prime is 20191441. The next prime is 20191459. The reversal of 20191449 is 94419102.

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 not a de Polignac number, because 20191449 - 2³ = 20191441 is a prime.

It is a super-2 number, since 2×20191449² = 815389225439202, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20191441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365239 + ... + 3365244.

It is an arithmetic number, because the mean of its divisors is an integer number (6730484).

Almost surely, 2^20191449 is an apocalyptic number.

It is an amenable number.

20191449 is a deficient number, since it is larger than the sum of its proper divisors (6730487).

20191449 is an equidigital number, since it uses as much as digits as its factorization.

20191449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6730486.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20191449 is about 4493.4896238892. The cubic root of 20191449 is about 272.3051335276.

The spelling of 20191449 in words is "twenty million, one hundred ninety-one thousand, four hundred forty-nine".