20445125 has 8 divisors (see below), whose sum is σ = 25515672. Its totient is φ = 16356000.

The previous prime is 20445109. The next prime is 20445143. The reversal of 20445125 is 52154402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2989441 + 17455684 = 1729^2 + 4178^2 .

It is not a de Polignac number, because 20445125 - 2⁴ = 20445109 is a prime.

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 20445125.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81656 + ... + 81905.

It is an arithmetic number, because the mean of its divisors is an integer number (3189459).

Almost surely, 2^20445125 is an apocalyptic number.

20445125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20445125 is a deficient number, since it is larger than the sum of its proper divisors (5070547).

20445125 is an equidigital number, since it uses as much as digits as its factorization.

20445125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163576 (or 163566 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20445125 is about 4521.6285782890. The cubic root of 20445125 is about 273.4407626822.

Adding to 20445125 its reverse (52154402), we get a palindrome (72599527).

The spelling of 20445125 in words is "twenty million, four hundred forty-five thousand, one hundred twenty-five".