20563425 has 18 divisors (see below), whose sum is σ = 36831782. Its totient is φ = 10967040.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563425 is 52436502.

20563425 is a `hidden beast` number, since 2 + 0 + 5 + 634 + 25 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 69696 + 20493729 = 264^2 + 4527^2 .

It is not a de Polignac number, because 20563425 - 2¹³ = 20555233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45472 + ... + 45921.

Almost surely, 2^20563425 is an apocalyptic number.

20563425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20563425 is a deficient number, since it is larger than the sum of its proper divisors (16268357).

20563425 is a wasteful number, since it uses less digits than its factorization.

20563425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91409 (or 91401 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20563425 is about 4534.6912794588. The cubic root of 20563425 is about 273.9671449053.

Adding to 20563425 its reverse (52436502), we get a palindrome (72999927).

The spelling of 20563425 in words is "twenty million, five hundred sixty-three thousand, four hundred twenty-five".