20992019 has 2 divisors, whose sum is σ = 20992020. Its totient is φ = 20992018.

The previous prime is 20992007. The next prime is 20992039. The reversal of 20992019 is 91029902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20992019 - 2¹⁶ = 20926483 is a prime.

It is a super-2 number, since 2×20992019² = 881329723392722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20992039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496009 + 10496010.

It is an arithmetic number, because the mean of its divisors is an integer number (10496010).

Almost surely, 2^20992019 is an apocalyptic number.

20992019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20992019 is an equidigital number, since it uses as much as digits as its factorization.

20992019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 20992019 is about 4581.7048137129. The cubic root of 20992019 is about 275.8574624574.

The spelling of 20992019 in words is "twenty million, nine hundred ninety-two thousand, nineteen".