20407225 has 12 divisors (see below), whose sum is σ = 26794044. Its totient is φ = 15365120.

The previous prime is 20407199. The next prime is 20407229. The reversal of 20407225 is 52270402.

It can be written as a sum of positive squares in 6 ways, for example, as 622521 + 19784704 = 789^2 + 4448^2 .

It is not a de Polignac number, because 20407225 - 2¹³ = 20399033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20407196 and 20407205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20407229) 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, 23584 + ... + 24433.

It is an arithmetic number, because the mean of its divisors is an integer number (2232837).

Almost surely, 2^20407225 is an apocalyptic number.

20407225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20407225 is a deficient number, since it is larger than the sum of its proper divisors (6386819).

20407225 is a wasteful number, since it uses less digits than its factorization.

20407225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48044 (or 48039 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 20407225 is about 4517.4356663930. The cubic root of 20407225 is about 273.2716952361.

Adding to 20407225 its reverse (52270402), we get a palindrome (72677627).

The spelling of 20407225 in words is "twenty million, four hundred seven thousand, two hundred twenty-five".