20540449 has 8 divisors (see below), whose sum is σ = 21510720. Its totient is φ = 19576656.

The previous prime is 20540441. The next prime is 20540453. The reversal of 20540449 is 94404502.

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

It is a cyclic number.

It is not a de Polignac number, because 20540449 - 2³ = 20540441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540441) 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 7 ways as a sum of consecutive naturals, for example, 5607 + ... + 8515.

It is an arithmetic number, because the mean of its divisors is an integer number (2688840).

Almost surely, 2^20540449 is an apocalyptic number.

It is an amenable number.

20540449 is a deficient number, since it is larger than the sum of its proper divisors (970271).

20540449 is a wasteful number, since it uses less digits than its factorization.

20540449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20540449 is about 4532.1572126306. The cubic root of 20540449 is about 273.8650702270.

The spelling of 20540449 in words is "twenty million, five hundred forty thousand, four hundred forty-nine".