20123843 has 2 divisors, whose sum is σ = 20123844. Its totient is φ = 20123842.

The previous prime is 20123813. The next prime is 20123861. The reversal of 20123843 is 34832102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123843 - 2¹⁰ = 20122819 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061921 + 10061922.

It is an arithmetic number, because the mean of its divisors is an integer number (10061922).

Almost surely, 2^20123843 is an apocalyptic number.

20123843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123843 is an equidigital number, since it uses as much as digits as its factorization.

20123843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20123843 is about 4485.9606551997. The cubic root of 20123843 is about 272.0008785655. Note that the first 3 decimals are identical.

Adding to 20123843 its reverse (34832102), we get a palindrome (54955945).

The spelling of 20123843 in words is "twenty million, one hundred twenty-three thousand, eight hundred forty-three".