20916019 has 2 divisors, whose sum is σ = 20916020. Its totient is φ = 20916018.

The previous prime is 20915981. The next prime is 20916029. The reversal of 20916019 is 91061902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20916019 - 2⁷ = 20915891 is a prime.

It is a super-2 number, since 2×20916019² = 874959701616722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20916029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10458009 + 10458010.

It is an arithmetic number, because the mean of its divisors is an integer number (10458010).

Almost surely, 2^20916019 is an apocalyptic number.

20916019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20916019 is an equidigital number, since it uses as much as digits as its factorization.

20916019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 20916019 is about 4573.4034372664. The cubic root of 20916019 is about 275.5241529412.

The spelling of 20916019 in words is "twenty million, nine hundred sixteen thousand, nineteen".