20403023 has 2 divisors, whose sum is σ = 20403024. Its totient is φ = 20403022.

The previous prime is 20403013. The next prime is 20403073. The reversal of 20403023 is 32030402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20403023 - 2⁴ = 20403007 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20402989 and 20403007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201511 + 10201512.

It is an arithmetic number, because the mean of its divisors is an integer number (10201512).

Almost surely, 2^20403023 is an apocalyptic number.

20403023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403023 is an equidigital number, since it uses as much as digits as its factorization.

20403023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20403023 is about 4516.9705555826. The cubic root of 20403023 is about 273.2529377211.

Adding to 20403023 its reverse (32030402), we get a palindrome (52433425).

The spelling of 20403023 in words is "twenty million, four hundred three thousand, twenty-three".