20308225 has 12 divisors (see below), whose sum is σ = 28779904. Its totient is φ = 13925520.

The previous prime is 20308219. The next prime is 20308229. The reversal of 20308225 is 52280302.

It is not a de Polignac number, because 20308225 - 2⁷ = 20308097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20308196 and 20308205.

It is not an unprimeable number, because it can be changed into a prime (20308229) 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, 57849 + ... + 58198.

Almost surely, 2^20308225 is an apocalyptic number.

20308225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20308225 is a deficient number, since it is larger than the sum of its proper divisors (8471679).

20308225 is a wasteful number, since it uses less digits than its factorization.

20308225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116064 (or 116059 counting only the distinct ones).

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

The square root of 20308225 is about 4506.4648007058. The cubic root of 20308225 is about 272.8290780702.

Adding to 20308225 its reverse (52280302), we get a palindrome (72588527).

The spelling of 20308225 in words is "twenty million, three hundred eight thousand, two hundred twenty-five".