20287862513 has 2 divisors, whose sum is σ = 20287862514. Its totient is φ = 20287862512.

The previous prime is 20287862489. The next prime is 20287862531. The reversal of 20287862513 is 31526878202.

Together with next prime (20287862531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19705702129 + 582160384 = 140377^2 + 24128^2 .

It is a cyclic number.

It is not a de Polignac number, because 20287862513 - 2¹² = 20287858417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20287862113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10143931256 + 10143931257.

It is an arithmetic number, because the mean of its divisors is an integer number (10143931257).

Almost surely, 2^20287862513 is an apocalyptic number.

It is an amenable number.

20287862513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20287862513 is an equidigital number, since it uses as much as digits as its factorization.

20287862513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 20287862513 in words is "twenty billion, two hundred eighty-seven million, eight hundred sixty-two thousand, five hundred thirteen".