20550650987 has 2 divisors, whose sum is σ = 20550650988. Its totient is φ = 20550650986.

The previous prime is 20550650983. The next prime is 20550651007. The reversal of 20550650987 is 78905605502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20550650987 - 2² = 20550650983 is a prime.

It is not a weakly prime, because it can be changed into another prime (20550650983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275325493 + 10275325494.

It is an arithmetic number, because the mean of its divisors is an integer number (10275325494).

Almost surely, 2^20550650987 is an apocalyptic number.

20550650987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20550650987 is an equidigital number, since it uses as much as digits as its factorization.

20550650987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756000, while the sum is 47.

The spelling of 20550650987 in words is "twenty billion, five hundred fifty million, six hundred fifty thousand, nine hundred eighty-seven".