20512025 has 6 divisors (see below), whose sum is σ = 25434942. Its totient is φ = 16409600.

The previous prime is 20511977. The next prime is 20512031. The reversal of 20512025 is 52021502.

It can be written as a sum of positive squares in 3 ways, for example, as 405769 + 20106256 = 637^2 + 4484^2 .

It is not a de Polignac number, because 20512025 - 2²⁰ = 19463449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20511994 and 20512012.

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, 410216 + ... + 410265.

It is an arithmetic number, because the mean of its divisors is an integer number (4239157).

Almost surely, 2^20512025 is an apocalyptic number.

20512025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20512025 is a deficient number, since it is larger than the sum of its proper divisors (4922917).

20512025 is an equidigital number, since it uses as much as digits as its factorization.

20512025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820491 (or 820486 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20512025 is about 4529.0203134894. The cubic root of 20512025 is about 273.7386865212.

Adding to 20512025 its reverse (52021502), we get a palindrome (72533527).

The spelling of 20512025 in words is "twenty million, five hundred twelve thousand, twenty-five".