20505195 has 24 divisors (see below), whose sum is σ = 36372336. Its totient is φ = 10680768.

The previous prime is 20505193. The next prime is 20505197. The reversal of 20505195 is 59150502.

It is an interprime number because it is at equal distance from previous prime (20505193) and next prime (20505197).

It is not a de Polignac number, because 20505195 - 2¹ = 20505193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20505193) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 3364 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (1515514).

Almost surely, 2^20505195 is an apocalyptic number.

20505195 is a deficient number, since it is larger than the sum of its proper divisors (15867141).

20505195 is a wasteful number, since it uses less digits than its factorization.

20505195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10651 (or 10648 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 20505195 is about 4528.2662245058. The cubic root of 20505195 is about 273.7083003976.

Adding to 20505195 its reverse (59150502), we get a palindrome (79655697).

The spelling of 20505195 in words is "twenty million, five hundred five thousand, one hundred ninety-five".