20461225 has 12 divisors (see below), whose sum is σ = 25428060. Its totient is φ = 16332800.

The previous prime is 20461223. The next prime is 20461253. The reversal of 20461225 is 52216402.

It can be written as a sum of positive squares in 6 ways, for example, as 7327849 + 13133376 = 2707^2 + 3624^2 .

It is not a de Polignac number, because 20461225 - 2¹ = 20461223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20461196 and 20461205.

It is not an unprimeable number, because it can be changed into a prime (20461223) 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, 21561 + ... + 22489.

It is an arithmetic number, because the mean of its divisors is an integer number (2119005).

Almost surely, 2^20461225 is an apocalyptic number.

20461225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20461225 is a deficient number, since it is larger than the sum of its proper divisors (4966835).

20461225 is an equidigital number, since it uses as much as digits as its factorization.

20461225 is an evil number, because the sum of its binary digits is even.

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

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20461225 is about 4523.4085599247. The cubic root of 20461225 is about 273.5125196608.

Adding to 20461225 its reverse (52216402), we get a palindrome (72677627).

The spelling of 20461225 in words is "twenty million, four hundred sixty-one thousand, two hundred twenty-five".