20910719 has 2 divisors, whose sum is σ = 20910720. Its totient is φ = 20910718.

The previous prime is 20910713. The next prime is 20910727. The reversal of 20910719 is 91701902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20910719 is a prime.

It is a super-2 number, since 2×20910719² = 874516338193922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20910691 and 20910700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20910713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455359 + 10455360.

It is an arithmetic number, because the mean of its divisors is an integer number (10455360).

Almost surely, 2^20910719 is an apocalyptic number.

20910719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910719 is an equidigital number, since it uses as much as digits as its factorization.

20910719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 20910719 is about 4572.8239633732. The cubic root of 20910719 is about 275.5008788920.

The spelling of 20910719 in words is "twenty million, nine hundred ten thousand, seven hundred nineteen".