20520225 has 36 divisors (see below), whose sum is σ = 40100112. Its totient is φ = 9948000.

The previous prime is 20520221. The next prime is 20520229. The reversal of 20520225 is 52202502.

It is an interprime number because it is at equal distance from previous prime (20520221) and next prime (20520229).

It is not a de Polignac number, because 20520225 - 2² = 20520221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20520198 and 20520207.

It is not an unprimeable number, because it can be changed into a prime (20520221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1671 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (1113892).

Almost surely, 2^20520225 is an apocalyptic number.

20520225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20520225 is a deficient number, since it is larger than the sum of its proper divisors (19579887).

20520225 is a wasteful number, since it uses less digits than its factorization.

20520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8318 (or 8310 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20520225 is about 4529.9254960761. The cubic root of 20520225 is about 273.7751587561.

Adding to 20520225 its reverse (52202502), we get a palindrome (72722727).

The spelling of 20520225 in words is "twenty million, five hundred twenty thousand, two hundred twenty-five".