20725000 has 48 divisors (see below), whose sum is σ = 48629700. Its totient is φ = 8280000.

The previous prime is 20724973. The next prime is 20725007. The reversal of 20725000 is 52702.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2010724 + 18714276 = 1418^2 + 4326^2 .

It is not an unprimeable number, because it can be changed into a prime (20725007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24586 + ... + 25414.

Almost surely, 2^20725000 is an apocalyptic number.

20725000 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 20725000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24314850).

20725000 is an abundant number, since it is smaller than the sum of its proper divisors (27904700).

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

20725000 is an frugal number, since it uses more digits than its factorization.

20725000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20725000 is about 4552.4718560360. The cubic root of 20725000 is about 274.6828299262.

Adding to 20725000 its reverse (52702), we get a palindrome (20777702).

The spelling of 20725000 in words is "twenty million, seven hundred twenty-five thousand".