20437316987 has 2 divisors, whose sum is σ = 20437316988. Its totient is φ = 20437316986.

The previous prime is 20437316971. The next prime is 20437316993. The reversal of 20437316987 is 78961373402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20437316987 - 2⁴ = 20437316971 is a prime.

It is not a weakly prime, because it can be changed into another prime (20437316087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10218658493 + 10218658494.

It is an arithmetic number, because the mean of its divisors is an integer number (10218658494).

Almost surely, 2^20437316987 is an apocalyptic number.

20437316987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20437316987 is an equidigital number, since it uses as much as digits as its factorization.

20437316987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The spelling of 20437316987 in words is "twenty billion, four hundred thirty-seven million, three hundred sixteen thousand, nine hundred eighty-seven".