20503325 has 6 divisors (see below), whose sum is σ = 25424154. Its totient is φ = 16402640.

The previous prime is 20503313. The next prime is 20503333. The reversal of 20503325 is 52330502.

It can be written as a sum of positive squares in 3 ways, for example, as 45796 + 20457529 = 214^2 + 4523^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20503325 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20503297 and 20503306.

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, 410042 + ... + 410091.

It is an arithmetic number, because the mean of its divisors is an integer number (4237359).

Almost surely, 2^20503325 is an apocalyptic number.

20503325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20503325 is a deficient number, since it is larger than the sum of its proper divisors (4920829).

20503325 is an equidigital number, since it uses as much as digits as its factorization.

20503325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820143 (or 820138 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 20503325 is about 4528.0597390052. The cubic root of 20503325 is about 273.6999797406.

Adding to 20503325 its reverse (52330502), we get a palindrome (72833827).

The spelling of 20503325 in words is "twenty million, five hundred three thousand, three hundred twenty-five".