20540225 has 12 divisors (see below), whose sum is σ = 25889340. Its totient is φ = 16161600.

The previous prime is 20540209. The next prime is 20540227. The reversal of 20540225 is 52204502.

It can be written as a sum of positive squares in 6 ways, for example, as 2765569 + 17774656 = 1663^2 + 4216^2 .

It is not a de Polignac number, because 20540225 - 2⁴ = 20540209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20540197 and 20540206.

It is not an unprimeable number, because it can be changed into a prime (20540227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5210 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (2157445).

Almost surely, 2^20540225 is an apocalyptic number.

20540225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20540225 is a deficient number, since it is larger than the sum of its proper divisors (5349115).

20540225 is a wasteful number, since it uses less digits than its factorization.

20540225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13540 (or 13535 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20540225 is about 4532.1325002696. The cubic root of 20540225 is about 273.8640746954.

Adding to 20540225 its reverse (52204502), we get a palindrome (72744727).

The spelling of 20540225 in words is "twenty million, five hundred forty thousand, two hundred twenty-five".