20209085 has 32 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 14112000.

The previous prime is 20209081. The next prime is 20209087. The reversal of 20209085 is 58090202.

It is not a de Polignac number, because 20209085 - 2² = 20209081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20209081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133760 + ... + 133910.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^20209085 is an apocalyptic number.

It is an amenable number.

20209085 is a deficient number, since it is larger than the sum of its proper divisors (7369795).

20209085 is a wasteful number, since it uses less digits than its factorization.

20209085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20209085 is about 4495.4515902187. The cubic root of 20209085 is about 272.3843911021.

Adding to 20209085 its reverse (58090202), we get a palindrome (78299287).

The spelling of 20209085 in words is "twenty million, two hundred nine thousand, eighty-five".