20190605 has 4 divisors (see below), whose sum is σ = 24228732. Its totient is φ = 16152480.

The previous prime is 20190601. The next prime is 20190613. The reversal of 20190605 is 50609102.

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 4206601 + 15984004 = 2051^2 + 3998^2 .

It is not a de Polignac number, because 20190605 - 2² = 20190601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2019056 + ... + 2019065.

It is an arithmetic number, because the mean of its divisors is an integer number (6057183).

Almost surely, 2^20190605 is an apocalyptic number.

It is an amenable number.

20190605 is a deficient number, since it is larger than the sum of its proper divisors (4038127).

20190605 is an equidigital number, since it uses as much as digits as its factorization.

20190605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038126.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20190605 is about 4493.3957092604. The cubic root of 20190605 is about 272.3013393681.

Adding to 20190605 its reverse (50609102), we get a palindrome (70799707).

The spelling of 20190605 in words is "twenty million, one hundred ninety thousand, six hundred five".