20525000 has 48 divisors (see below), whose sum is σ = 48160980. Its totient is φ = 8200000.

The previous prime is 20524991. The next prime is 20525009. The reversal of 20525000 is 52502.

It is an interprime number because it is at equal distance from previous prime (20524991) and next prime (20525009).

It can be written as a sum of positive squares in 6 ways, for example, as 4251844 + 16273156 = 2062^2 + 4034^2 .

It is not an unprimeable number, because it can be changed into a prime (20525009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24590 + ... + 25410.

Almost surely, 2^20525000 is an apocalyptic number.

20525000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20525000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24080490).

20525000 is an abundant number, since it is smaller than the sum of its proper divisors (27635980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20525000 is an frugal number, since it uses more digits than its factorization.

20525000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 20525000 is about 4530.4525160297. The cubic root of 20525000 is about 273.7963926850.

Adding to 20525000 its reverse (52502), we get a palindrome (20577502).

The spelling of 20525000 in words is "twenty million, five hundred twenty-five thousand".