20740025 has 6 divisors (see below), whose sum is σ = 25717662. Its totient is φ = 16592000.

The previous prime is 20740021. The next prime is 20740063. The reversal of 20740025 is 52004702.

It can be written as a sum of positive squares in 3 ways, for example, as 19321 + 20720704 = 139^2 + 4552^2 .

It is not a de Polignac number, because 20740025 - 2² = 20740021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20739979 and 20740006.

It is not an unprimeable number, because it can be changed into a prime (20740021) 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, 414776 + ... + 414825.

It is an arithmetic number, because the mean of its divisors is an integer number (4286277).

Almost surely, 2^20740025 is an apocalyptic number.

20740025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20740025 is a deficient number, since it is larger than the sum of its proper divisors (4977637).

20740025 is an equidigital number, since it uses as much as digits as its factorization.

20740025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829611 (or 829606 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20740025 is about 4554.1217594614. The cubic root of 20740025 is about 274.7491928144.

Adding to 20740025 its reverse (52004702), we get a palindrome (72744727).

The spelling of 20740025 in words is "twenty million, seven hundred forty thousand, twenty-five".