20161787 has 2 divisors, whose sum is σ = 20161788. Its totient is φ = 20161786.

The previous prime is 20161753. The next prime is 20161789. The reversal of 20161787 is 78716102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20161787 - 2¹⁴ = 20145403 is a prime.

Together with 20161789, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20161789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080893 + 10080894.

It is an arithmetic number, because the mean of its divisors is an integer number (10080894).

Almost surely, 2^20161787 is an apocalyptic number.

20161787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161787 is an equidigital number, since it uses as much as digits as its factorization.

20161787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 20161787 is about 4490.1878579855. The cubic root of 20161787 is about 272.1717260094.

Adding to 20161787 its reverse (78716102), we get a palindrome (98877889).

The spelling of 20161787 in words is "twenty million, one hundred sixty-one thousand, seven hundred eighty-seven".