20508325 has 6 divisors (see below), whose sum is σ = 25430354. Its totient is φ = 16406640.

The previous prime is 20508317. The next prime is 20508349. The reversal of 20508325 is 52380502.

It can be written as a sum of positive squares in 3 ways, for example, as 2411809 + 18096516 = 1553^2 + 4254^2 .

It is not a de Polignac number, because 20508325 - 2³ = 20508317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 820333 = 20508325 / (2 + 0 + 5 + 0 + 8 + 3 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20508325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410142 + ... + 410191.

Almost surely, 2^20508325 is an apocalyptic number.

20508325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20508325 is a deficient number, since it is larger than the sum of its proper divisors (4922029).

20508325 is an equidigital number, since it uses as much as digits as its factorization.

20508325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820343 (or 820338 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20508325 is about 4528.6118182065. The cubic root of 20508325 is about 273.7222263546.

Adding to 20508325 its reverse (52380502), we get a palindrome (72888827).

The spelling of 20508325 in words is "twenty million, five hundred eight thousand, three hundred twenty-five".