20625305 has 8 divisors (see below), whose sum is σ = 25029000. Its totient is φ = 16314496.

The previous prime is 20625299. The next prime is 20625313. The reversal of 20625305 is 50352602.

20625305 = 248² + 249² + ... + 425².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4624 + 20620681 = 68^2 + 4541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20625305 - 2⁸ = 20625049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22730 + ... + 23619.

It is an arithmetic number, because the mean of its divisors is an integer number (3128625).

Almost surely, 2^20625305 is an apocalyptic number.

It is an amenable number.

20625305 is a deficient number, since it is larger than the sum of its proper divisors (4403695).

20625305 is an equidigital number, since it uses as much as digits as its factorization.

20625305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46443.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20625305 is about 4541.5091104169. The cubic root of 20625305 is about 274.2416794259.

Adding to 20625305 its reverse (50352602), we get a palindrome (70977907).

The spelling of 20625305 in words is "twenty million, six hundred twenty-five thousand, three hundred five".