20105125 has 8 divisors (see below), whose sum is σ = 25091352. Its totient is φ = 16084000.

The previous prime is 20105119. The next prime is 20105131. The reversal of 20105125 is 52150102.

It is an interprime number because it is at equal distance from previous prime (20105119) and next prime (20105131).

It can be written as a sum of positive squares in 4 ways, for example, as 231361 + 19873764 = 481^2 + 4458^2 .

It is not a de Polignac number, because 20105125 - 2³ = 20105117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20105099 and 20105108.

It is a congruent number.

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, 80296 + ... + 80545.

It is an arithmetic number, because the mean of its divisors is an integer number (3136419).

Almost surely, 2^20105125 is an apocalyptic number.

20105125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20105125 is a deficient number, since it is larger than the sum of its proper divisors (4986227).

20105125 is an equidigital number, since it uses as much as digits as its factorization.

20105125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160856 (or 160846 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20105125 is about 4483.8738831506. The cubic root of 20105125 is about 271.9165194000.

Adding to 20105125 its reverse (52150102), we get a palindrome (72255227).

It can be divided in two parts, 20 and 105125, that multiplied together give a square (2102500 = 1450²).

The spelling of 20105125 in words is "twenty million, one hundred five thousand, one hundred twenty-five".