20250000 has 175 divisors, whose sum is σ = 73260781. Its totient is φ = 5400000.

The previous prime is 20249969. The next prime is 20250007. The reversal of 20250000 is 5202.

The square root of 20250000 is 4500.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 17740944 + 2509056 = 4212^2 + 1584^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20250007) 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 34 ways as a sum of consecutive naturals, for example, 4049998 + ... + 4050002.

Almost surely, 2^20250000 is an apocalyptic number.

20250000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

20250000 is the 4500-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20250000

20250000 is an abundant number, since it is smaller than the sum of its proper divisors (53010781).

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

20250000 is an frugal number, since it uses more digits than its factorization.

20250000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The cubic root of 20250000 is about 272.5680889248.

Adding to 20250000 its reverse (5202), we get a palindrome (20255202).

The spelling of 20250000 in words is "twenty million, two hundred fifty thousand".