20863904251 has 2 divisors, whose sum is σ = 20863904252. Its totient is φ = 20863904250.

The previous prime is 20863904249. The next prime is 20863904387. The reversal of 20863904251 is 15240936802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20863904251 - 2¹ = 20863904249 is a prime.

It is a super-3 number, since 3×20863904251³ (a number of 32 digits) contains 333 as substring.

Together with 20863904249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20863904851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431952125 + 10431952126.

It is an arithmetic number, because the mean of its divisors is an integer number (10431952126).

Almost surely, 2^20863904251 is an apocalyptic number.

20863904251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863904251 is an equidigital number, since it uses as much as digits as its factorization.

20863904251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20863904251 in words is "twenty billion, eight hundred sixty-three million, nine hundred four thousand, two hundred fifty-one".