20520043 has 2 divisors, whose sum is σ = 20520044. Its totient is φ = 20520042.

The previous prime is 20520041. The next prime is 20520053. The reversal of 20520043 is 34002502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20520043 - 2¹ = 20520041 is a prime.

Together with 20520041, it forms a pair of twin primes.

It is equal to p_1301461 and since 20520043 and 1301461 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20519999 and 20520026.

It is not a weakly prime, because it can be changed into another prime (20520041) 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 as a sum of consecutive naturals, namely, 10260021 + 10260022.

It is an arithmetic number, because the mean of its divisors is an integer number (10260022).

Almost surely, 2^20520043 is an apocalyptic number.

20520043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520043 is an equidigital number, since it uses as much as digits as its factorization.

20520043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20520043 is about 4529.9054074009. The cubic root of 20520043 is about 273.7743493558.

Adding to 20520043 its reverse (34002502), we get a palindrome (54522545).

The spelling of 20520043 in words is "twenty million, five hundred twenty thousand, forty-three".