20470843 has 4 divisors (see below), whose sum is σ = 20480040. Its totient is φ = 20461648.

The previous prime is 20470841. The next prime is 20470867. The reversal of 20470843 is 34807402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20470843 - 2¹ = 20470841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20470841) 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 3 ways as a sum of consecutive naturals, for example, 1071 + ... + 6487.

It is an arithmetic number, because the mean of its divisors is an integer number (5120010).

Almost surely, 2^20470843 is an apocalyptic number.

20470843 is a deficient number, since it is larger than the sum of its proper divisors (9197).

20470843 is an equidigital number, since it uses as much as digits as its factorization.

20470843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20470843 is about 4524.4715713550. The cubic root of 20470843 is about 273.5553686974. Note that the first 3 decimals are identical.

The spelling of 20470843 in words is "twenty million, four hundred seventy thousand, eight hundred forty-three".