20392859 has 4 divisors (see below), whose sum is σ = 20480616. Its totient is φ = 20305104.

The previous prime is 20392847. The next prime is 20392873. The reversal of 20392859 is 95829302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20392859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20392159) 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, 43529 + ... + 43994.

It is an arithmetic number, because the mean of its divisors is an integer number (5120154).

Almost surely, 2^20392859 is an apocalyptic number.

20392859 is a deficient number, since it is larger than the sum of its proper divisors (87757).

20392859 is an equidigital number, since it uses as much as digits as its factorization.

20392859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87756.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 20392859 is about 4515.8453250748. The cubic root of 20392859 is about 273.2075554890.

The spelling of 20392859 in words is "twenty million, three hundred ninety-two thousand, eight hundred fifty-nine".