20416987 has 2 divisors, whose sum is σ = 20416988. Its totient is φ = 20416986.

The previous prime is 20416961. The next prime is 20416999. The reversal of 20416987 is 78961402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20416987 - 2¹¹ = 20414939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20416927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208493 + 10208494.

It is an arithmetic number, because the mean of its divisors is an integer number (10208494).

Almost surely, 2^20416987 is an apocalyptic number.

20416987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416987 is an equidigital number, since it uses as much as digits as its factorization.

20416987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20416987 is about 4518.5160174553. The cubic root of 20416987 is about 273.3152623720.

The spelling of 20416987 in words is "twenty million, four hundred sixteen thousand, nine hundred eighty-seven".