20009081 has 8 divisors (see below), whose sum is σ = 20590944. Its totient is φ = 19435680.

The previous prime is 20009053. The next prime is 20009113. The reversal of 20009081 is 18090002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20009081 is a prime.

It is a super-2 number, since 2×20009081² = 800726644929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20009581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2846 + ... + 6936.

It is an arithmetic number, because the mean of its divisors is an integer number (2573868).

Almost surely, 2^20009081 is an apocalyptic number.

It is an amenable number.

20009081 is a deficient number, since it is larger than the sum of its proper divisors (581863).

20009081 is an equidigital number, since it uses as much as digits as its factorization.

20009081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4231.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 20009081 is about 4473.1511264432. The cubic root of 20009081 is about 271.4828381538.

Adding to 20009081 its reverse (18090002), we get a palindrome (38099083).

The spelling of 20009081 in words is "twenty million, nine thousand, eighty-one".