20286191 has 4 divisors (see below), whose sum is σ = 20571984. Its totient is φ = 20000400.

The previous prime is 20286179. The next prime is 20286197. The reversal of 20286191 is 19168202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19168202 = 2 ⋅9584101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20286191 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20286197) 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, 142790 + ... + 142931.

It is an arithmetic number, because the mean of its divisors is an integer number (5142996).

Almost surely, 2^20286191 is an apocalyptic number.

20286191 is a deficient number, since it is larger than the sum of its proper divisors (285793).

20286191 is an equidigital number, since it uses as much as digits as its factorization.

20286191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285792.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 20286191 is about 4504.0194271339. The cubic root of 20286191 is about 272.7303710793.

The spelling of 20286191 in words is "twenty million, two hundred eighty-six thousand, one hundred ninety-one".