20849841 has 12 divisors (see below), whose sum is σ = 30159220. Its totient is φ = 13880160.

The previous prime is 20849839. The next prime is 20849903. The reversal of 20849841 is 14894802.

It can be written as a sum of positive squares in 2 ways, for example, as 5475600 + 15374241 = 2340^2 + 3921^2 .

It is not a de Polignac number, because 20849841 - 2¹ = 20849839 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20849796 and 20849805.

It is not an unprimeable number, because it can be changed into a prime (20849041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8055 + ... + 10323.

Almost surely, 2^20849841 is an apocalyptic number.

It is an amenable number.

20849841 is a deficient number, since it is larger than the sum of its proper divisors (9309379).

20849841 is a wasteful number, since it uses less digits than its factorization.

20849841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296 (or 3293 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20849841 is about 4566.1626120847. The cubic root of 20849841 is about 275.2332610401.

The spelling of 20849841 in words is "twenty million, eight hundred forty-nine thousand, eight hundred forty-one".