20985595 has 8 divisors (see below), whose sum is σ = 26508240. Its totient is φ = 15904800.

The previous prime is 20985593. The next prime is 20985617. The reversal of 20985595 is 59558902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20985595 - 2¹ = 20985593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20985593) 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 7 ways as a sum of consecutive naturals, for example, 110356 + ... + 110545.

It is an arithmetic number, because the mean of its divisors is an integer number (3313530).

Almost surely, 2^20985595 is an apocalyptic number.

20985595 is a deficient number, since it is larger than the sum of its proper divisors (5522645).

20985595 is a wasteful number, since it uses less digits than its factorization.

20985595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220925.

The product of its (nonzero) digits is 162000, while the sum is 43.

The square root of 20985595 is about 4581.0037109786. The cubic root of 20985595 is about 275.8293201884.

It can be divided in two parts, 209855 and 95, that multiplied together give a square (19936225 = 4465²).

The spelling of 20985595 in words is "twenty million, nine hundred eighty-five thousand, five hundred ninety-five".