25820017 has 4 divisors (see below), whose sum is σ = 25927396. Its totient is φ = 25712640.

The previous prime is 25819999. The next prime is 25820021. The reversal of 25820017 is 71002852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20784481 + 5035536 = 4559^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 25820017 - 2¹¹ = 25817969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25819973 and 25820000.

It is not an unprimeable number, because it can be changed into a prime (25820087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53328 + ... + 53809.

It is an arithmetic number, because the mean of its divisors is an integer number (6481849).

Almost surely, 2^25820017 is an apocalyptic number.

It is an amenable number.

25820017 is a deficient number, since it is larger than the sum of its proper divisors (107379).

25820017 is a wasteful number, since it uses less digits than its factorization.

25820017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107378.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 25820017 is about 5081.3400791523. The cubic root of 25820017 is about 295.5644350121.

Adding to 25820017 its reverse (71002852), we get a palindrome (96822869).

The spelling of 25820017 in words is "twenty-five million, eight hundred twenty thousand, seventeen".