20425305 has 16 divisors (see below), whose sum is σ = 32780160. Its totient is φ = 10860288.

The previous prime is 20425303. The next prime is 20425319. The reversal of 20425305 is 50352402.

It is not a de Polignac number, because 20425305 - 2¹ = 20425303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20425303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3489 + ... + 7281.

It is an arithmetic number, because the mean of its divisors is an integer number (2048760).

Almost surely, 2^20425305 is an apocalyptic number.

It is an amenable number.

20425305 is a deficient number, since it is larger than the sum of its proper divisors (12354855).

20425305 is a wasteful number, since it uses less digits than its factorization.

20425305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20425305 is about 4519.4363586624. The cubic root of 20425305 is about 273.3523740784.

Adding to 20425305 its reverse (50352402), we get a palindrome (70777707).

The spelling of 20425305 in words is "twenty million, four hundred twenty-five thousand, three hundred five".