20678843 has 2 divisors, whose sum is σ = 20678844. Its totient is φ = 20678842.

The previous prime is 20678839. The next prime is 20678857. The reversal of 20678843 is 34887602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20678843 - 2² = 20678839 is a prime.

It is a super-2 number, since 2×20678843² = 855229095637298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20678797 and 20678806.

It is not a weakly prime, because it can be changed into another prime (20678873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339421 + 10339422.

It is an arithmetic number, because the mean of its divisors is an integer number (10339422).

Almost surely, 2^20678843 is an apocalyptic number.

20678843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678843 is an equidigital number, since it uses as much as digits as its factorization.

20678843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20678843 is about 4547.3995865769. The cubic root of 20678843 is about 274.4787614221.

The spelling of 20678843 in words is "twenty million, six hundred seventy-eight thousand, eight hundred forty-three".