20112091 has 4 divisors (see below), whose sum is σ = 20135752. Its totient is φ = 20088432.

The previous prime is 20112073. The next prime is 20112107. The reversal of 20112091 is 19021102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19021102 = 2 ⋅9510551.

It is a cyclic number.

It is not a de Polignac number, because 20112091 - 2⁹ = 20111579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112031) 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, 10506 + ... + 12271.

It is an arithmetic number, because the mean of its divisors is an integer number (5033938).

Almost surely, 2^20112091 is an apocalyptic number.

20112091 is a deficient number, since it is larger than the sum of its proper divisors (23661).

20112091 is an equidigital number, since it uses as much as digits as its factorization.

20112091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23660.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 20112091 is about 4484.6505995451. The cubic root of 20112091 is about 271.9479202120.

Adding to 20112091 its reverse (19021102), we get a palindrome (39133193).

The spelling of 20112091 in words is "twenty million, one hundred twelve thousand, ninety-one".