20560985 has 4 divisors (see below), whose sum is σ = 24673188. Its totient is φ = 16448784.

The previous prime is 20560933. The next prime is 20560987. The reversal of 20560985 is 58906502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58906502 = 2 ⋅29453251.

It can be written as a sum of positive squares in 2 ways, for example, as 13097161 + 7463824 = 3619^2 + 2732^2 .

It is a cyclic number.

It is not a de Polignac number, because 20560985 - 2⁶ = 20560921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20560987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056094 + ... + 2056103.

It is an arithmetic number, because the mean of its divisors is an integer number (6168297).

Almost surely, 2^20560985 is an apocalyptic number.

It is an amenable number.

20560985 is a deficient number, since it is larger than the sum of its proper divisors (4112203).

20560985 is an equidigital number, since it uses as much as digits as its factorization.

20560985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112202.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 20560985 is about 4534.4222344197. The cubic root of 20560985 is about 273.9563084116.

The spelling of 20560985 in words is "twenty million, five hundred sixty thousand, nine hundred eighty-five".