20839241 has 4 divisors (see below), whose sum is σ = 20913684. Its totient is φ = 20764800.

The previous prime is 20839201. The next prime is 20839243. The reversal of 20839241 is 14293802.

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 14100025 + 6739216 = 3755^2 + 2596^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20839241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20839243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36800 + ... + 37361.

It is an arithmetic number, because the mean of its divisors is an integer number (5228421).

Almost surely, 2^20839241 is an apocalyptic number.

It is an amenable number.

20839241 is a deficient number, since it is larger than the sum of its proper divisors (74443).

20839241 is an equidigital number, since it uses as much as digits as its factorization.

20839241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74442.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20839241 is about 4565.0017524641. The cubic root of 20839241 is about 275.1866105306.

The spelling of 20839241 in words is "twenty million, eight hundred thirty-nine thousand, two hundred forty-one".