20209125 has 16 divisors (see below), whose sum is σ = 33628608. Its totient is φ = 10778000.

The previous prime is 20209121. The next prime is 20209139. The reversal of 20209125 is 52190202.

It is not a de Polignac number, because 20209125 - 2² = 20209121 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26571 + ... + 27320.

It is an arithmetic number, because the mean of its divisors is an integer number (2101788).

Almost surely, 2^20209125 is an apocalyptic number.

20209125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20209125 is a deficient number, since it is larger than the sum of its proper divisors (13419483).

20209125 is an equidigital number, since it uses as much as digits as its factorization.

20209125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53909 (or 53899 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20209125 is about 4495.4560391578. The cubic root of 20209125 is about 272.3845708128.

Adding to 20209125 its reverse (52190202), we get a palindrome (72399327).

The spelling of 20209125 in words is "twenty million, two hundred nine thousand, one hundred twenty-five".