20849427 has 16 divisors (see below), whose sum is σ = 30976000. Its totient is φ = 13860072.

The previous prime is 20849417. The next prime is 20849461. The reversal of 20849427 is 72494802.

It is not a de Polignac number, because 20849427 - 2¹⁵ = 20816659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20849391 and 20849400.

It is not an unprimeable number, because it can be changed into a prime (20849417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10974 + ... + 12732.

It is an arithmetic number, because the mean of its divisors is an integer number (1936000).

Almost surely, 2^20849427 is an apocalyptic number.

20849427 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20849427 is a deficient number, since it is larger than the sum of its proper divisors (10126573).

20849427 is a wasteful number, since it uses less digits than its factorization.

20849427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207 (or 2201 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20849427 is about 4566.1172783887. The cubic root of 20849427 is about 275.2314393264.

It can be divided in two parts, 2084 and 9427, that added together give a palindrome (11511).

The spelling of 20849427 in words is "twenty million, eight hundred forty-nine thousand, four hundred twenty-seven".