20416843 has 4 divisors (see below), whose sum is σ = 20721640. Its totient is φ = 20112048.

The previous prime is 20416829. The next prime is 20416853. The reversal of 20416843 is 34861402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20416843 is a prime.

It is the 4519-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20416853) by changing a digit.

It is a nontrivial repunit in base 4518.

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 3 ways as a sum of consecutive naturals, for example, 152298 + ... + 152431.

It is an arithmetic number, because the mean of its divisors is an integer number (5180410).

Almost surely, 2^20416843 is an apocalyptic number.

20416843 is a deficient number, since it is larger than the sum of its proper divisors (304797).

20416843 is an equidigital number, since it uses as much as digits as its factorization.

20416843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304796.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20416843 is about 4518.5000829921. The cubic root of 20416843 is about 273.3146198108.

The spelling of 20416843 in words is "twenty million, four hundred sixteen thousand, eight hundred forty-three".