20617423 has 2 divisors, whose sum is σ = 20617424. Its totient is φ = 20617422.

The previous prime is 20617417. The next prime is 20617469. The reversal of 20617423 is 32471602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20617423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20617523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308711 + 10308712.

It is an arithmetic number, because the mean of its divisors is an integer number (10308712).

Almost surely, 2^20617423 is an apocalyptic number.

20617423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20617423 is an equidigital number, since it uses as much as digits as its factorization.

20617423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20617423 is about 4540.6412542724. The cubic root of 20617423 is about 274.2067409797.

The spelling of 20617423 in words is "twenty million, six hundred seventeen thousand, four hundred twenty-three".