20849413 has 4 divisors (see below), whose sum is σ = 22453228. Its totient is φ = 19245600.

The previous prime is 20849401. The next prime is 20849417. The reversal of 20849413 is 31494802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9132484 + 11716929 = 3022^2 + 3423^2 .

It is a cyclic number.

It is not a de Polignac number, because 20849413 - 2⁹ = 20848901 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 (20849417) 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, 801888 + ... + 801913.

It is an arithmetic number, because the mean of its divisors is an integer number (5613307).

Almost surely, 2^20849413 is an apocalyptic number.

It is an amenable number.

20849413 is a deficient number, since it is larger than the sum of its proper divisors (1603815).

20849413 is a wasteful number, since it uses less digits than its factorization.

20849413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603814.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20849413 is about 4566.1157453573. The cubic root of 20849413 is about 275.2313777221.

The spelling of 20849413 in words is "twenty million, eight hundred forty-nine thousand, four hundred thirteen".