20043913 has 2 divisors, whose sum is σ = 20043914. Its totient is φ = 20043912.

The previous prime is 20043871. The next prime is 20043923. The reversal of 20043913 is 31934002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 5702544 = 3787^2 + 2388^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20043913 is a prime.

It is not a weakly prime, because it can be changed into another prime (20043923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021956 + 10021957.

It is an arithmetic number, because the mean of its divisors is an integer number (10021957).

Almost surely, 2^20043913 is an apocalyptic number.

It is an amenable number.

20043913 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043913 is an equidigital number, since it uses as much as digits as its factorization.

20043913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20043913 is about 4477.0428856557. The cubic root of 20043913 is about 271.6402801393.

Adding to 20043913 its reverse (31934002), we get a palindrome (51977915).

The spelling of 20043913 in words is "twenty million, forty-three thousand, nine hundred thirteen".