20604625 has 8 divisors (see below), whose sum is σ = 25714728. Its totient is φ = 16483600.

The previous prime is 20604613. The next prime is 20604679. The reversal of 20604625 is 52640602.

It can be written as a sum of positive squares in 4 ways, for example, as 641601 + 19963024 = 801^2 + 4468^2 .

It is not a de Polignac number, because 20604625 - 2¹¹ = 20602577 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20604625.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 82294 + ... + 82543.

It is an arithmetic number, because the mean of its divisors is an integer number (3214341).

Almost surely, 2^20604625 is an apocalyptic number.

20604625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20604625 is a deficient number, since it is larger than the sum of its proper divisors (5110103).

20604625 is an equidigital number, since it uses as much as digits as its factorization.

20604625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164852 (or 164842 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20604625 is about 4539.2317631952. The cubic root of 20604625 is about 274.1499924676.

The spelling of 20604625 in words is "twenty million, six hundred four thousand, six hundred twenty-five".