20025605 has 4 divisors (see below), whose sum is σ = 24030732. Its totient is φ = 16020480.

The previous prime is 20025583. The next prime is 20025611. The reversal of 20025605 is 50652002.

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 5410276 + 14615329 = 2326^2 + 3823^2 .

It is not a de Polignac number, because 20025605 - 2¹⁰ = 20024581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002556 + ... + 2002565.

It is an arithmetic number, because the mean of its divisors is an integer number (6007683).

Almost surely, 2^20025605 is an apocalyptic number.

It is an amenable number.

20025605 is a deficient number, since it is larger than the sum of its proper divisors (4005127).

20025605 is an equidigital number, since it uses as much as digits as its factorization.

20025605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005126.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20025605 is about 4474.9977653626. The cubic root of 20025605 is about 271.5575500326.

Adding to 20025605 its sum of digits (20), we get a square (20025625 = 4475²).

Adding to 20025605 its reverse (50652002), we get a palindrome (70677607).

The spelling of 20025605 in words is "twenty million, twenty-five thousand, six hundred five".