20839361 has 4 divisors (see below), whose sum is σ = 20896512. Its totient is φ = 20782212.

The previous prime is 20839339. The next prime is 20839367. The reversal of 20839361 is 16393802.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20839361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20839367) 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, 28025 + ... + 28758.

It is an arithmetic number, because the mean of its divisors is an integer number (5224128).

Almost surely, 2^20839361 is an apocalyptic number.

It is an amenable number.

20839361 is a deficient number, since it is larger than the sum of its proper divisors (57151).

20839361 is an equidigital number, since it uses as much as digits as its factorization.

20839361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57150.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20839361 is about 4565.0148959231. The cubic root of 20839361 is about 275.1871387381.

The spelling of 20839361 in words is "twenty million, eight hundred thirty-nine thousand, three hundred sixty-one".