20612225 has 6 divisors (see below), whose sum is σ = 25559190. Its totient is φ = 16489760.

The previous prime is 20612203. The next prime is 20612231. The reversal of 20612225 is 52221602.

It can be written as a sum of positive squares in 3 ways, for example, as 7311616 + 13300609 = 2704^2 + 3647^2 .

It is not a de Polignac number, because 20612225 - 2¹² = 20608129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20612197 and 20612206.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 412220 + ... + 412269.

It is an arithmetic number, because the mean of its divisors is an integer number (4259865).

Almost surely, 2^20612225 is an apocalyptic number.

20612225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20612225 is a deficient number, since it is larger than the sum of its proper divisors (4946965).

20612225 is an equidigital number, since it uses as much as digits as its factorization.

20612225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824499 (or 824494 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20612225 is about 4540.0688320773. The cubic root of 20612225 is about 274.1836949951.

Adding to 20612225 its reverse (52221602), we get a palindrome (72833827).

The spelling of 20612225 in words is "twenty million, six hundred twelve thousand, two hundred twenty-five".