20418025 has 12 divisors (see below), whose sum is σ = 25374492. Its totient is φ = 16298240.

The previous prime is 20418011. The next prime is 20418031. The reversal of 20418025 is 52081402.

It can be written as a sum of positive squares in 6 ways, for example, as 104976 + 20313049 = 324^2 + 4507^2 .

It is not a de Polignac number, because 20418025 - 2⁷ = 20417897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20417987 and 20418005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20949 + ... + 21901.

It is an arithmetic number, because the mean of its divisors is an integer number (2114541).

Almost surely, 2^20418025 is an apocalyptic number.

20418025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20418025 is a deficient number, since it is larger than the sum of its proper divisors (4956467).

20418025 is an equidigital number, since it uses as much as digits as its factorization.

20418025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20418025 is about 4518.6308767148. The cubic root of 20418025 is about 273.3198940778.

Adding to 20418025 its reverse (52081402), we get a palindrome (72499427).

The spelling of 20418025 in words is "twenty million, four hundred eighteen thousand, twenty-five".