20442859 has 4 divisors (see below), whose sum is σ = 20451904. Its totient is φ = 20433816.

The previous prime is 20442853. The next prime is 20442871. The reversal of 20442859 is 95824402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20442859 - 2⁵ = 20442827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442853) 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, 2149 + ... + 6745.

It is an arithmetic number, because the mean of its divisors is an integer number (5112976).

Almost surely, 2^20442859 is an apocalyptic number.

20442859 is a deficient number, since it is larger than the sum of its proper divisors (9045).

20442859 is an equidigital number, since it uses as much as digits as its factorization.

20442859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20442859 is about 4521.3779979117. The cubic root of 20442859 is about 273.4306601979.

The spelling of 20442859 in words is "twenty million, four hundred forty-two thousand, eight hundred fifty-nine".