20515095 has 24 divisors (see below), whose sum is σ = 36065952. Its totient is φ = 10785600.

The previous prime is 20515069. The next prime is 20515097. The reversal of 20515095 is 59051502.

It is not a de Polignac number, because 20515095 - 2⁹ = 20514583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20515097) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 16 + ... + 6405.

It is an arithmetic number, because the mean of its divisors is an integer number (1502748).

Almost surely, 2^20515095 is an apocalyptic number.

20515095 is a deficient number, since it is larger than the sum of its proper divisors (15550857).

20515095 is a wasteful number, since it uses less digits than its factorization.

20515095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6503 (or 6500 counting only the distinct ones).

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

The square root of 20515095 is about 4529.3592262041. The cubic root of 20515095 is about 273.7523425083.

Adding to 20515095 its reverse (59051502), we get a palindrome (79566597).

The spelling of 20515095 in words is "twenty million, five hundred fifteen thousand, ninety-five".