20839161 has 48 divisors (see below), whose sum is σ = 35458560. Its totient is φ = 10805760.

The previous prime is 20839157. The next prime is 20839187. The reversal of 20839161 is 16193802.

It is not a de Polignac number, because 20839161 - 2² = 20839157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20839141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77335 + ... + 77603.

It is an arithmetic number, because the mean of its divisors is an integer number (738720).

Almost surely, 2^20839161 is an apocalyptic number.

20839161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20839161 is a deficient number, since it is larger than the sum of its proper divisors (14619399).

20839161 is a wasteful number, since it uses less digits than its factorization.

20839161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20839161 is about 4564.9929901370. The cubic root of 20839161 is about 275.1862583911.

The spelling of 20839161 in words is "twenty million, eight hundred thirty-nine thousand, one hundred sixty-one".