20545849 has 4 divisors (see below), whose sum is σ = 20568064. Its totient is φ = 20523636.

The previous prime is 20545829. The next prime is 20545871. The reversal of 20545849 is 94854502.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94854502 = 2 ⋅47427251.

It is a cyclic number.

It is not a de Polignac number, because 20545849 - 2⁵ = 20545817 is a prime.

It is a super-2 number, since 2×20545849² = 844263822261602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545829) 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, 9657 + ... + 11590.

It is an arithmetic number, because the mean of its divisors is an integer number (5142016).

Almost surely, 2^20545849 is an apocalyptic number.

It is an amenable number.

20545849 is a deficient number, since it is larger than the sum of its proper divisors (22215).

20545849 is an equidigital number, since it uses as much as digits as its factorization.

20545849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22214.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 20545849 is about 4532.7529162751. The cubic root of 20545849 is about 273.8890674597.

The spelling of 20545849 in words is "twenty million, five hundred forty-five thousand, eight hundred forty-nine".