20730719 has 2 divisors, whose sum is σ = 20730720. Its totient is φ = 20730718.

The previous prime is 20730623. The next prime is 20730733. The reversal of 20730719 is 91703702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20730719 is a prime.

It is a super-2 number, since 2×20730719² = 859525420513922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20730691 and 20730700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20730739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365359 + 10365360.

It is an arithmetic number, because the mean of its divisors is an integer number (10365360).

Almost surely, 2^20730719 is an apocalyptic number.

20730719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730719 is an equidigital number, since it uses as much as digits as its factorization.

20730719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 20730719 is about 4553.0999330127. The cubic root of 20730719 is about 274.7080935632.

The spelling of 20730719 in words is "twenty million, seven hundred thirty thousand, seven hundred nineteen".