20465719 has 2 divisors, whose sum is σ = 20465720. Its totient is φ = 20465718.

The previous prime is 20465707. The next prime is 20465723. The reversal of 20465719 is 91756402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20465719 is a prime.

It is a super-2 number, since 2×20465719² = 837691308373922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20465729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232859 + 10232860.

It is an arithmetic number, because the mean of its divisors is an integer number (10232860).

Almost surely, 2^20465719 is an apocalyptic number.

20465719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465719 is an equidigital number, since it uses as much as digits as its factorization.

20465719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 20465719 is about 4523.9052819439. The cubic root of 20465719 is about 273.5325424972.

The spelling of 20465719 in words is "twenty million, four hundred sixty-five thousand, seven hundred nineteen".