20442085 has 4 divisors (see below), whose sum is σ = 24530508. Its totient is φ = 16353664.

The previous prime is 20442061. The next prime is 20442091. The reversal of 20442085 is 58024402.

It is a happy number.

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 13645636 + 6796449 = 3694^2 + 2607^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442085 - 2⁵ = 20442053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044204 + ... + 2044213.

It is an arithmetic number, because the mean of its divisors is an integer number (6132627).

Almost surely, 2^20442085 is an apocalyptic number.

It is an amenable number.

20442085 is a deficient number, since it is larger than the sum of its proper divisors (4088423).

20442085 is an equidigital number, since it uses as much as digits as its factorization.

20442085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4088422.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 20442085 is about 4521.2924037271. The cubic root of 20442085 is about 273.4272093107.

Adding to 20442085 its reverse (58024402), we get a palindrome (78466487).

It can be divided in two parts, 2044 and 2085, that multiplied together give a triangular number (4261740 = T₂₉₁₉).

The spelling of 20442085 in words is "twenty million, four hundred forty-two thousand, eighty-five".