20051245987 has 2 divisors, whose sum is σ = 20051245988. Its totient is φ = 20051245986.

The previous prime is 20051245967. The next prime is 20051245999. The reversal of 20051245987 is 78954215002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20051245987 - 2¹¹ = 20051243939 is a prime.

It is not a weakly prime, because it can be changed into another prime (20051245957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025622993 + 10025622994.

It is an arithmetic number, because the mean of its divisors is an integer number (10025622994).

Almost surely, 2^20051245987 is an apocalyptic number.

20051245987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051245987 is an equidigital number, since it uses as much as digits as its factorization.

20051245987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 20051245987 in words is "twenty billion, fifty-one million, two hundred forty-five thousand, nine hundred eighty-seven".