20090843 has 2 divisors, whose sum is σ = 20090844. Its totient is φ = 20090842.

The previous prime is 20090839. The next prime is 20090849. The reversal of 20090843 is 34809002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20090843 - 2² = 20090839 is a prime.

It is not a weakly prime, because it can be changed into another prime (20090849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045421 + 10045422.

It is an arithmetic number, because the mean of its divisors is an integer number (10045422).

Almost surely, 2^20090843 is an apocalyptic number.

20090843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090843 is an equidigital number, since it uses as much as digits as its factorization.

20090843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20090843 is about 4482.2810041317. The cubic root of 20090843 is about 271.8521173853.

Adding to 20090843 its reverse (34809002), we get a palindrome (54899845).

The spelling of 20090843 in words is "twenty million, ninety thousand, eight hundred forty-three".