20345625 has 30 divisors (see below), whose sum is σ = 36733554. Its totient is φ = 10848000.

The previous prime is 20345621. The next prime is 20345629. The reversal of 20345625 is 52654302.

20345625 is a `hidden beast` number, since 2 + 0 + 34 + 5 + 625 = 666.

It is an interprime number because it is at equal distance from previous prime (20345621) and next prime (20345629).

It can be written as a sum of positive squares in 5 ways, for example, as 15023376 + 5322249 = 3876^2 + 2307^2 .

It is not a de Polignac number, because 20345625 - 2² = 20345621 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20345621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3817 + ... + 7433.

Almost surely, 2^20345625 is an apocalyptic number.

20345625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20345625 is a deficient number, since it is larger than the sum of its proper divisors (16387929).

20345625 is an equidigital number, since it uses as much as digits as its factorization.

20345625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20345625 is about 4510.6124861265. The cubic root of 20345625 is about 272.9964577087.

Adding to 20345625 its reverse (52654302), we get a palindrome (72999927).

The spelling of 20345625 in words is "twenty million, three hundred forty-five thousand, six hundred twenty-five".