20403013 has 2 divisors, whose sum is σ = 20403014. Its totient is φ = 20403012.

The previous prime is 20403011. The next prime is 20403023. The reversal of 20403013 is 31030402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 3617604 = 4097^2 + 1902^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403013 - 2¹ = 20403011 is a prime.

Together with 20403011, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20402984 and 20403002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403011) 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, 10201506 + 10201507.

It is an arithmetic number, because the mean of its divisors is an integer number (10201507).

Almost surely, 2^20403013 is an apocalyptic number.

It is an amenable number.

20403013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403013 is an equidigital number, since it uses as much as digits as its factorization.

20403013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20403013 is about 4516.9694486459. The cubic root of 20403013 is about 273.2528930786.

Adding to 20403013 its reverse (31030402), we get a palindrome (51433415).

The spelling of 20403013 in words is "twenty million, four hundred three thousand, thirteen".