20312525 has 6 divisors (see below), whose sum is σ = 25187562. Its totient is φ = 16250000.

The previous prime is 20312497. The next prime is 20312531. The reversal of 20312525 is 52521302.

It can be written as a sum of positive squares in 3 ways, for example, as 44521 + 20268004 = 211^2 + 4502^2 .

It is not a de Polignac number, because 20312525 - 2¹⁴ = 20296141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20312497 and 20312506.

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, 406226 + ... + 406275.

It is an arithmetic number, because the mean of its divisors is an integer number (4197927).

Almost surely, 2^20312525 is an apocalyptic number.

20312525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20312525 is a deficient number, since it is larger than the sum of its proper divisors (4875037).

20312525 is an equidigital number, since it uses as much as digits as its factorization.

20312525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812511 (or 812506 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20312525 is about 4506.9418678301. The cubic root of 20312525 is about 272.8483327030.

Adding to 20312525 its reverse (52521302), we get a palindrome (72833827).

The spelling of 20312525 in words is "twenty million, three hundred twelve thousand, five hundred twenty-five".