20105525 has 24 divisors (see below), whose sum is σ = 27480384. Its totient is φ = 14470400.

The previous prime is 20105521. The next prime is 20105549. The reversal of 20105525 is 52550102.

It is not a de Polignac number, because 20105525 - 2² = 20105521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20105497 and 20105506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30752 + ... + 31398.

It is an arithmetic number, because the mean of its divisors is an integer number (1145016).

Almost surely, 2^20105525 is an apocalyptic number.

20105525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20105525 is a deficient number, since it is larger than the sum of its proper divisors (7374859).

20105525 is a wasteful number, since it uses less digits than its factorization.

20105525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781 (or 776 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20105525 is about 4483.9184872163. The cubic root of 20105525 is about 271.9183226863.

Adding to 20105525 its reverse (52550102), we get a palindrome (72655627).

The spelling of 20105525 in words is "twenty million, one hundred five thousand, five hundred twenty-five".