20504025 has 18 divisors (see below), whose sum is σ = 36725390. Its totient is φ = 10935360.

The previous prime is 20504009. The next prime is 20504053. The reversal of 20504025 is 52040502.

It can be written as a sum of positive squares in 3 ways, for example, as 1108809 + 19395216 = 1053^2 + 4404^2 .

It is not a de Polignac number, because 20504025 - 2⁴ = 20504009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20503989 and 20504007.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45340 + ... + 45789.

Almost surely, 2^20504025 is an apocalyptic number.

20504025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20504025 is a deficient number, since it is larger than the sum of its proper divisors (16221365).

20504025 is a wasteful number, since it uses less digits than its factorization.

20504025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91145 (or 91137 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20504025 is about 4528.1370341455. The cubic root of 20504025 is about 273.7030944843.

Adding to 20504025 its reverse (52040502), we get a palindrome (72544527).

The spelling of 20504025 in words is "twenty million, five hundred four thousand, twenty-five".