20359985 has 8 divisors (see below), whose sum is σ = 25028136. Its totient is φ = 15890560.

The previous prime is 20359961. The next prime is 20359987. The reversal of 20359985 is 58995302.

It can be written as a sum of positive squares in 4 ways, for example, as 361201 + 19998784 = 601^2 + 4472^2 .

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

It is not a de Polignac number, because 20359985 - 2¹² = 20355889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20359987) 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, 49454 + ... + 49863.

It is an arithmetic number, because the mean of its divisors is an integer number (3128517).

Almost surely, 2^20359985 is an apocalyptic number.

It is an amenable number.

20359985 is a deficient number, since it is larger than the sum of its proper divisors (4668151).

20359985 is an equidigital number, since it uses as much as digits as its factorization.

20359985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99363.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 20359985 is about 4512.2040069128. The cubic root of 20359985 is about 273.0606698295.

The spelling of 20359985 in words is "twenty million, three hundred fifty-nine thousand, nine hundred eighty-five".