20340623 has 2 divisors, whose sum is σ = 20340624. Its totient is φ = 20340622.

The previous prime is 20340601. The next prime is 20340631. The reversal of 20340623 is 32604302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20340623 - 2⁶ = 20340559 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20340595 and 20340604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170311 + 10170312.

It is an arithmetic number, because the mean of its divisors is an integer number (10170312).

Almost surely, 2^20340623 is an apocalyptic number.

20340623 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340623 is an equidigital number, since it uses as much as digits as its factorization.

20340623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20340623 is about 4510.0579818889. The cubic root of 20340623 is about 272.9740836897.

Adding to 20340623 its reverse (32604302), we get a palindrome (52944925).

The spelling of 20340623 in words is "twenty million, three hundred forty thousand, six hundred twenty-three".