20306623 has 2 divisors, whose sum is σ = 20306624. Its totient is φ = 20306622.

The previous prime is 20306617. The next prime is 20306633. The reversal of 20306623 is 32660302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20306623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20306594 and 20306603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20306633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153311 + 10153312.

It is an arithmetic number, because the mean of its divisors is an integer number (10153312).

Almost surely, 2^20306623 is an apocalyptic number.

20306623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306623 is an equidigital number, since it uses as much as digits as its factorization.

20306623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 20306623 is about 4506.2870525522. The cubic root of 20306623 is about 272.8219039051.

Adding to 20306623 its reverse (32660302), we get a palindrome (52966925).

The spelling of 20306623 in words is "twenty million, three hundred six thousand, six hundred twenty-three".