20122787 has 2 divisors, whose sum is σ = 20122788. Its totient is φ = 20122786.

The previous prime is 20122763. The next prime is 20122807. The reversal of 20122787 is 78722102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20122787 - 2¹⁰ = 20121763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20122727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061393 + 10061394.

It is an arithmetic number, because the mean of its divisors is an integer number (10061394).

Almost surely, 2^20122787 is an apocalyptic number.

20122787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122787 is an equidigital number, since it uses as much as digits as its factorization.

20122787 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20122787 is about 4485.8429531137. The cubic root of 20122787 is about 271.9961207275.

Adding to 20122787 its reverse (78722102), we get a palindrome (98844889).

The spelling of 20122787 in words is "twenty million, one hundred twenty-two thousand, seven hundred eighty-seven".