20109091 has 8 divisors (see below), whose sum is σ = 20821824. Its totient is φ = 19408320.

The previous prime is 20109073. The next prime is 20109109. The reversal of 20109091 is 19090102.

It is an interprime number because it is at equal distance from previous prime (20109073) and next prime (20109109).

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

It is a cyclic number.

It is not a de Polignac number, because 20109091 - 2⁵ = 20109059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20109041) 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, 501 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (2602728).

Almost surely, 2^20109091 is an apocalyptic number.

20109091 is a deficient number, since it is larger than the sum of its proper divisors (712733).

20109091 is an equidigital number, since it uses as much as digits as its factorization.

20109091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5981.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 20109091 is about 4484.3161128538. The cubic root of 20109091 is about 271.9343979262.

Adding to 20109091 its reverse (19090102), we get a palindrome (39199193).

The spelling of 20109091 in words is "twenty million, one hundred nine thousand, ninety-one".