20239525 has 6 divisors (see below), whose sum is σ = 25097042. Its totient is φ = 16191600.

The previous prime is 20239523. The next prime is 20239529. The reversal of 20239525 is 52593202.

It can be written as a sum of positive squares in 3 ways, for example, as 178084 + 20061441 = 422^2 + 4479^2 .

It is not a de Polignac number, because 20239525 - 2¹ = 20239523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20239493 and 20239502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20239523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404766 + ... + 404815.

Almost surely, 2^20239525 is an apocalyptic number.

20239525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20239525 is a deficient number, since it is larger than the sum of its proper divisors (4857517).

20239525 is an equidigital number, since it uses as much as digits as its factorization.

20239525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809591 (or 809586 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 20239525 is about 4498.8359605569. The cubic root of 20239525 is about 272.5210824527.

The spelling of 20239525 in words is "twenty million, two hundred thirty-nine thousand, five hundred twenty-five".