20020312987 has 2 divisors, whose sum is σ = 20020312988. Its totient is φ = 20020312986.

The previous prime is 20020312979. The next prime is 20020313023. The reversal of 20020312987 is 78921302002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20020312987 - 2³ = 20020312979 is a prime.

It is a super-3 number, since 3×20020312987³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (20020312967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010156493 + 10010156494.

It is an arithmetic number, because the mean of its divisors is an integer number (10010156494).

Almost surely, 2^20020312987 is an apocalyptic number.

20020312987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020312987 is an equidigital number, since it uses as much as digits as its factorization.

20020312987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

Adding to 20020312987 its reverse (78921302002), we get a palindrome (98941614989).

The spelling of 20020312987 in words is "twenty billion, twenty million, three hundred twelve thousand, nine hundred eighty-seven".