20915023 has 2 divisors, whose sum is σ = 20915024. Its totient is φ = 20915022.

The previous prime is 20915021. The next prime is 20915039. The reversal of 20915023 is 32051902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20915023 - 2¹ = 20915021 is a prime.

Together with 20915021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20914985 and 20915003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20915021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10457511 + 10457512.

It is an arithmetic number, because the mean of its divisors is an integer number (10457512).

Almost surely, 2^20915023 is an apocalyptic number.

20915023 is a deficient number, since it is larger than the sum of its proper divisors (1).

20915023 is an equidigital number, since it uses as much as digits as its factorization.

20915023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20915023 is about 4573.2945455109. The cubic root of 20915023 is about 275.5197794765.

Adding to 20915023 its reverse (32051902), we get a palindrome (52966925).

The spelling of 20915023 in words is "twenty million, nine hundred fifteen thousand, twenty-three".