20746025 has 6 divisors (see below), whose sum is σ = 25725102. Its totient is φ = 16596800.

The previous prime is 20746021. The next prime is 20746027. The reversal of 20746025 is 52064702.

It can be written as a sum of positive squares in 3 ways, for example, as 5285401 + 15460624 = 2299^2 + 3932^2 .

It is not a de Polignac number, because 20746025 - 2² = 20746021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20745985 and 20746003.

It is not an unprimeable number, because it can be changed into a prime (20746021) 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 5 ways as a sum of consecutive naturals, for example, 414896 + ... + 414945.

It is an arithmetic number, because the mean of its divisors is an integer number (4287517).

Almost surely, 2^20746025 is an apocalyptic number.

20746025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20746025 is a deficient number, since it is larger than the sum of its proper divisors (4979077).

20746025 is an equidigital number, since it uses as much as digits as its factorization.

20746025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829851 (or 829846 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20746025 is about 4554.7804557410. The cubic root of 20746025 is about 274.7756848464.

The spelling of 20746025 in words is "twenty million, seven hundred forty-six thousand, twenty-five".