20138125 has 20 divisors (see below), whose sum is σ = 28765792. Its totient is φ = 13806000.

The previous prime is 20138089. The next prime is 20138159. The reversal of 20138125 is 52183102.

It is not a de Polignac number, because 20138125 - 2²¹ = 18040973 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20138096 and 20138105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2074 + ... + 6676.

Almost surely, 2^20138125 is an apocalyptic number.

20138125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20138125 is a deficient number, since it is larger than the sum of its proper divisors (8627667).

20138125 is an frugal number, since it uses more digits than its factorization.

20138125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4630 (or 4615 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20138125 is about 4487.5522281083. The cubic root of 20138125 is about 272.0652101796.

The spelling of 20138125 in words is "twenty million, one hundred thirty-eight thousand, one hundred twenty-five".