20609125 has 16 divisors (see below), whose sum is σ = 26058240. Its totient is φ = 16270800.

The previous prime is 20609123. The next prime is 20609131. The reversal of 20609125 is 52190602.

It is not a de Polignac number, because 20609125 - 2¹ = 20609123 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20609125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609123) 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 15 ways as a sum of consecutive naturals, for example, 8832 + ... + 10918.

It is an arithmetic number, because the mean of its divisors is an integer number (1628640).

Almost surely, 2^20609125 is an apocalyptic number.

20609125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20609125 is a deficient number, since it is larger than the sum of its proper divisors (5449115).

20609125 is an equidigital number, since it uses as much as digits as its factorization.

20609125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2171 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20609125 is about 4539.7274147244. The cubic root of 20609125 is about 274.1699489121.

Adding to 20609125 its reverse (52190602), we get a palindrome (72799727).

It can be divided in two parts, 206091 and 25, that added together give a square (206116 = 454²).

The spelling of 20609125 in words is "twenty million, six hundred nine thousand, one hundred twenty-five".