20104787 has 2 divisors, whose sum is σ = 20104788. Its totient is φ = 20104786.

The previous prime is 20104769. The next prime is 20104811. The reversal of 20104787 is 78740102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20104787 - 2⁸ = 20104531 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20104187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052393 + 10052394.

It is an arithmetic number, because the mean of its divisors is an integer number (10052394).

Almost surely, 2^20104787 is an apocalyptic number.

20104787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104787 is an equidigital number, since it uses as much as digits as its factorization.

20104787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20104787 is about 4483.8361923692. The cubic root of 20104787 is about 271.9149956045.

Adding to 20104787 its reverse (78740102), we get a palindrome (98844889).

The spelling of 20104787 in words is "twenty million, one hundred four thousand, seven hundred eighty-seven".