20403225 has 48 divisors (see below), whose sum is σ = 37914240. Its totient is φ = 10756800.

The previous prime is 20403223. The next prime is 20403233. The reversal of 20403225 is 52230402.

It is not a de Polignac number, because 20403225 - 2¹ = 20403223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20403198 and 20403207.

It is not an unprimeable number, because it can be changed into a prime (20403221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112635 + ... + 112815.

It is an arithmetic number, because the mean of its divisors is an integer number (789880).

Almost surely, 2^20403225 is an apocalyptic number.

20403225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20403225 is a deficient number, since it is larger than the sum of its proper divisors (17511015).

20403225 is a wasteful number, since it uses less digits than its factorization.

20403225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20403225 is about 4516.9929156464. The cubic root of 20403225 is about 273.2538394978.

Adding to 20403225 its reverse (52230402), we get a palindrome (72633627).

The spelling of 20403225 in words is "twenty million, four hundred three thousand, two hundred twenty-five".