20191149 has 18 divisors (see below), whose sum is σ = 32059118. Its totient is φ = 12236400.

The previous prime is 20191141. The next prime is 20191151. The reversal of 20191149 is 94119102.

20191149 = 347² + 348² + ... + 467².

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 3175524 = 4125^2 + 1782^2 .

It is not a de Polignac number, because 20191149 - 2³ = 20191141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8182 + ... + 10359.

Almost surely, 2^20191149 is an apocalyptic number.

It is an amenable number.

20191149 is a deficient number, since it is larger than the sum of its proper divisors (11867969).

20191149 is a wasteful number, since it uses less digits than its factorization.

20191149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18569 (or 18555 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 20191149 is about 4493.4562421370. The cubic root of 20191149 is about 272.3037849048.

The spelling of 20191149 in words is "twenty million, one hundred ninety-one thousand, one hundred forty-nine".