20809082 has 8 divisors (see below), whose sum is σ = 35672736. Its totient is φ = 8918172.

The previous prime is 20809073. The next prime is 20809097. The reversal of 20809082 is 28090802.

20809082 is nontrivially palindromic in base 6.

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

It is a super-3 number, since 3×20809082³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743168 + ... + 743195.

It is an arithmetic number, because the mean of its divisors is an integer number (4459092).

Almost surely, 2^20809082 is an apocalyptic number.

20809082 is a deficient number, since it is larger than the sum of its proper divisors (14863654).

20809082 is a wasteful number, since it uses less digits than its factorization.

20809082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486372.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20809082 is about 4561.6972718496. The cubic root of 20809082 is about 275.0537944349.

Adding to 20809082 its reverse (28090802), we get a palindrome (48899884).

The spelling of 20809082 in words is "twenty million, eight hundred nine thousand, eighty-two".