20985195 has 32 divisors (see below), whose sum is σ = 41863680. Its totient is φ = 8720640.

The previous prime is 20985187. The next prime is 20985197. The reversal of 20985195 is 59158902.

It is not a de Polignac number, because 20985195 - 2³ = 20985187 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (20985197) 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 31 ways as a sum of consecutive naturals, for example, 7930 + ... + 10239.

It is an arithmetic number, because the mean of its divisors is an integer number (1308240).

Almost surely, 2^20985195 is an apocalyptic number.

20985195 is a deficient number, since it is larger than the sum of its proper divisors (20878485).

20985195 is a wasteful number, since it uses less digits than its factorization.

20985195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18195.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 20985195 is about 4580.9600522161. The cubic root of 20985195 is about 275.8275676778.

The spelling of 20985195 in words is "twenty million, nine hundred eighty-five thousand, one hundred ninety-five".